# Addition

Here is a list of all of the skills that cover addition! These skills are organized by grade, and you can move your mouse over any skill name to view a sample question. To start practicing, just click on any link. IXL will track your score, and the questions will automatically increase in difficulty as you improve!

## Kindergarten skills

- I.1Addition with pictures - sums up to 5
- I.2Add two numbers - sums up to 5
- I.3Addition sentences - sums up to 5
- I.4Ways to make a number - sums up to 5
- I.5Addition word problems - sums up to 5
- I.6Addition with pictures - sums up to 10
- I.7Add two numbers - sums up to 10
- I.8Addition sentences - sums up to 10
- I.9Ways to make a number - sums up to 10
- I.10Addition word problems - sums up to 10
- I.11Addition sentences – sums equal to 10
- T.1Sum and difference

## First-grade skills

- B.1Addition with pictures - sums to 10
- B.2Addition sentences - sums to 10
- B.3Addition sentences to 10 using number lines
- B.4Addition word problems - sums to 10
- B.5Word problems - write the addition sentence
- B.6Ways to make a number using addition
- B.7Ways to make a number - addition sentences
- B.8Adding zero
- B.9Adding doubles using models
- B.10Adding doubles
- B.11Adding doubles - complete the sentence
- B.12Addition facts - sums to 10
- B.13Addition sentences to 18 using number lines
- B.14Addition facts - sums to 18
- B.15Addition word problems - sums to 18
- B.16Complete the addition sentence
- B.17Adding three numbers
- B.18Word problems - adding three numbers
- B.19Related addition facts
- B.20Add using doubles plus 1
- B.21Add using doubles minus 1
- B.22Addition facts - sums to 20
- B.23Addition sentences: true or false?
- B.24Add tens I
- B.25Add tens II
- B.26Add a one-digit number to a two-digit number - without regrouping
- B.27Regrouping tens and ones I
- B.28Regrouping tens and ones II
- B.29Add a one-digit number to a two-digit number - with regrouping
- C.1Adding 0
- C.2Adding 1
- C.3Adding 2
- C.4Adding 3
- C.5Adding 4
- C.6Adding 5
- C.7Adding 6
- C.8Adding 7
- C.9Adding 8
- C.10Adding 9
- F.1Addition and subtraction - ways to make a number
- F.2Which sign makes the number sentence true?
- F.3Fact families
- F.4Addition and subtraction facts - numbers up to 10
- F.5Addition and subtraction facts - numbers up to 18
- F.6Addition and subtraction word problems
- F.7Addition and subtraction sentences: true or false?
- F.8Ten more or less
- F.9Add and subtract tens
- F.10Addition and subtraction terms

## Second-grade skills

- B.2Inequalities with addition and subtraction - up to 100
- E.1Review - add one-digit numbers - sums to 10
- E.2Review - ways to make a number - sums to 10
- E.3Review - writing addition sentences - sums to 10
- E.4Add one-digit numbers
- E.5Addition with pictures - sums to 20
- E.6Write addition sentences to describe pictures - sums to 20
- E.7Addition input/output tables - sums to 20
- E.8Add zero
- E.9Add doubles using models
- E.10Add doubles
- E.11Add doubles - complete the sentence
- E.12Addition word problems - one digit
- E.13Complete the addition sentence - one digit
- E.14Write the addition sentence - one digit
- E.15Balance addition equations - one digit
- E.16Addition equations: true or false?
- E.17Add three or more one-digit numbers
- E.18Add three or more one-digit numbers - word problems
- E.19Identify repeated addition in arrays: sums to 10
- E.20Write addition sentences for arrays: sums to 10
- E.21Identify repeated addition in arrays: sums to 25
- E.22Write addition sentences for arrays: sums to 25
- G.1Add multiples of 10
- G.2Add a two-digit and a one-digit number - without regrouping
- G.3Add a two-digit and a one-digit number - with regrouping
- G.4Add two two-digit numbers - without regrouping
- G.5Add two two-digit numbers - with regrouping
- G.6Write addition sentences to describe pictures
- G.7Addition input/output tables - up to two digits
- G.8Ways to make a number using addition
- G.9Addition word problems - up to two digits
- G.10Complete the addition sentence - up to two digits
- G.11Write the addition sentence - up to two digits
- G.12Balance addition equations - up to two digits
- G.13Add three or more numbers up to two digits each
- G.14Add three or more numbers up to two digits - word problems
- I.1Add multiples of 100
- I.2Add two three-digit numbers
- I.3Addition input/output tables - up to three digits
- I.4Addition word problems - up to three digits
- I.5Complete the addition sentence - up to three digits
- I.6Write the addition sentence - up to three digits
- I.7Balance addition equations - up to three digits
- K.1Related addition facts
- K.3Fact families
- K.5Solve inequalities using addition and subtraction shortcuts
- L.1Add and subtract numbers up to 20
- L.2Addition and subtraction - ways to make a number - up to 20
- L.3Addition and subtraction word problems - up to 20
- L.4Addition and subtraction - balance equations - up to 20
- L.5Addition and subtraction equations up to 20: true or false?
- L.6Input/output tables - write the rule - up to 20
- L.7Add and subtract numbers up to 100
- L.8Addition and subtraction - ways to make a number - up to 100
- L.9Addition and subtraction word problems - up to 100
- L.10Addition and subtraction - balance equations - up to 100
- L.11Input/output tables - write the rule - up to 100
- L.12Which sign (+ or -) makes the number sentence true?
- L.13Write addition and subtraction sentences
- N.5Estimate sums
- P.8Add and subtract money - up to $1
- P.9Add and subtract money - word problems - up to $1

## Third-grade skills

- A.11Comparing - with addition and subtraction
- A.12Multi-step inequalities
- C.1Add two numbers up to three digits
- C.2Addition input/output tables - up to three digits
- C.3Add two numbers up to three digits - word problems
- C.4Complete the addition sentence - up to three digits
- C.5Balance addition equations - up to three digits
- C.6Add three or more numbers up to three digits each
- C.7Add three or more numbers up to three digits - word problems
- C.8Addition patterns over increasing place values
- C.9Add two numbers with four or more digits
- C.10Addition input/output tables - four or more digits
- C.11Add two numbers with four or more digits - word problems
- C.12Complete the addition sentence - four or more digits
- C.13Balance equations - four or more digits
- C.14Add three or more numbers with four or more digits
- C.15Add three or more numbers with four or more digits - word problems
- C.16Addition: fill in the missing digits
- J.3Properties of addition
- J.4Solve using properties of addition
- J.9Relate addition and multiplication
- L.5Estimate sums
- N.7Add and subtract money amounts
- N.8Add money amounts - word problems
- V.3Add fractions with like denominators using number lines
- W.7Add and subtract decimals
- W.8Add and subtract decimals - word problems
- W.9Add three or more decimal numbers

## Fourth-grade skills

- B.1Add numbers up to millions
- B.2Add numbers up to millions: word problems
- B.3Addition: fill in the missing digits
- B.4Properties of addition
- B.5Add 3 or more numbers up to millions
- B.6Addition patterns over increasing place values
- B.7Choose numbers with a particular sum
- B.8Estimate sums
- B.9Estimate sums: word problems
- F.8Mentally add and subtract numbers ending in zeroes
- M.3Add and subtract money amounts
- M.6Price lists with addition and subtraction
- R.4Add fractions with like denominators using number lines
- R.7Add and subtract fractions with like denominators
- R.8Add and subtract fractions with like denominators: word problems
- R.10Add 3 or more fractions with like denominators
- R.11Add and subtract mixed numbers with like denominators
- S.1Add fractions with unlike denominators
- S.3Add up to 4 fractions with denominators of 10 and 100
- S.4Add and subtract fractions with denominators of 10, 100, and 1000
- S.5Add and subtract fractions with unlike denominators: word problems
- S.9Add 3 or more fractions with unlike denominators
- S.10Add 3 or more fractions with like and unlike denominators: word problems
- S.11Find the missing numerator or denominator in addition and subtraction sentences
- S.12Add and subtract mixed numbers with unlike denominators
- S.13Add and subtract mixed numbers with like and unlike denominators: word problems
- S.14Inequalities with addition and subtraction of fractions
- V.1Add decimal numbers
- V.3Add and subtract decimals: word problems
- V.4Choose decimals with a particular sum or difference
- V.5Add 3 or more decimals
- V.6Add 3 or more decimals: word problems
- V.7Complete the addition or subtraction sentence
- V.8Inequalities with addition and subtraction
- V.9Estimate sums and differences of decimals

## Fifth-grade skills

- D.1Add and subtract whole numbers up to billions
- D.2Add and subtract whole numbers: word problems
- D.3Add and subtract money amounts
- D.4Add and subtract money: word problems
- D.5Complete addition and subtraction sentences
- D.6Fill in the missing digits
- D.7Choose numbers with a particular sum or difference
- D.8Properties of addition
- D.9Inequalities with addition and subtraction
- D.10Estimate sums and differences of whole numbers
- D.11Estimate sums and differences: word problems
- E.1Add and subtract decimal numbers
- E.2Add and subtract decimals: word problems
- E.3Choose decimals with a particular sum or difference
- E.4Complete the addition or subtraction sentence
- E.5Inequalities with decimal addition and subtraction
- E.6Estimate sums and differences of decimals
- M.2Add and subtract fractions with like denominators
- M.3Add and subtract fractions with like denominators: word problems
- M.4Add and subtract mixed numbers with like denominators
- M.6Add fractions with unlike denominators
- M.8Add and subtract fractions with unlike denominators: word problems
- M.9Add 3 or more fractions with unlike denominators
- M.10Add 3 or more fractions: word problems
- M.12Complete addition and subtraction sentences with fractions
- M.13Inequalities with addition and subtraction of fractions
- M.14Estimate sums and differences of mixed numbers
- M.15Add mixed numbers with unlike denominators
- M.17Add and subtract mixed numbers: word problems
- M.19Complete addition and subtraction sentences with mixed numbers
- M.20Inequalities with addition and subtraction of mixed numbers

## Sixth-grade skills

- D.4Add and subtract rational numbers
- F.2Add and subtract money amounts
- F.3Add and subtract money amounts: word problems
- I.1Review - add and subtract whole numbers
- I.2Review - add and subtract whole numbers: word problems
- I.3Properties of addition
- I.4Integer addition and subtraction rules
- I.5Add integers - using counters
- I.6Add integers
- I.9Add and subtract integers - input/output tables
- I.10Add three or more integers
- J.1Add and subtract decimal numbers
- J.2Add and subtract decimals: word problems
- J.3Estimate sums and differences of decimals
- J.4Maps with decimal distances
- U.1Add and subtract fractions with like denominators
- U.2Add and subtract fractions with like denominators: word problems
- U.3Add and subtract fractions with unlike denominators
- U.4Add and subtract fractions with unlike denominators: word problems
- U.5Inequalities with addition and subtraction of like and unlike fractions
- U.6Add and subtract mixed numbers
- U.7Add and subtract mixed numbers: word problems
- U.8Estimate sums and differences of mixed numbers
- U.9Maps with fractional distances

## Seventh-grade skills

- C.1Add and subtract decimals
- C.2Add and subtract decimals: word problems
- C.10Maps with decimal distances
- E.1Integer addition and subtraction rules
- E.2Add and subtract integers using counters
- E.3Add and subtract integers
- E.4Complete addition and subtraction sentences with integers
- E.5Add and subtract integers: word problems
- G.1Add and subtract fractions
- G.2Add and subtract fractions: word problems
- G.3Add and subtract mixed numbers
- G.4Add and subtract mixed numbers: word problems
- G.5Inequalities with addition and subtraction of fractions and mixed numbers
- G.6Estimate sums and differences of mixed numbers
- G.16Maps with fractional distances
- H.6Add and subtract rational numbers
- Y.1Properties of addition and multiplication

## Eighth-grade skills

- C.1Integer addition and subtraction rules
- C.2Add and subtract integers using counters
- C.3Add and subtract integers
- C.4Add and subtract three or more integers
- C.5Add and subtract integers: word problems
- E.2Add and subtract rational numbers
- E.3Add and subtract rational numbers: word problems
- AA.1Properties of addition and multiplication