🇺🇸 CCSS Math · Grade 5

5.NBT.B.6: Division with two-digit divisors

5.NBT.B.6 explained: whole-number division with up to four-digit dividends and two-digit divisors using place value, area models and equations.

Common Core standard CCSS.Math.Content.5.NBT.B.6

Find whole-number quotients of whole numbers with up to four-digit dividends and two-digit divisors, using strategies based on place value, the properties of operations, and/or the relationship between multiplication and division. Illustrate and explain the calculation by using equations, rectangular arrays, and/or area models.

Grade
Grade 5
Domain
Number & Operations in Base Ten (NBT)
Cluster
Perform operations with multi-digit whole numbers and with decimals to hundredths

Official wording from the Common Core State Standards for Mathematics (© 2010 National Governors Association Center for Best Practices and Council of Chief State School Officers). View on thecorestandards.org

What 5.NBT.B.6 means

Fifth graders extend division to two-digit divisors, finding whole-number quotients for problems such as 1,728 ÷ 24. The standard deliberately stops short of requiring the standard long division algorithm, which is a sixth grade fluency goal. Instead students use strategies grounded in place value, the properties of operations and the link between multiplication and division.

A common strategy is partial quotients: subtract friendly multiples of the divisor, such as 24 × 50 = 1,200 and then 24 × 20 = 480, and keep track of how many 24s have been removed. Area models show the same thinking as a rectangle with one side 24, split into pieces whose areas add to the dividend. Students should be able to illustrate and explain their calculation with equations, arrays or area models and check a quotient by multiplying it back. Interpreting a remainder in a word problem is also part of the work.

Students should be able to

  • Divide a three- or four-digit number by a two-digit number using partial quotients.
  • Represent a division with an area model or rectangular array and explain each part.
  • Use multiplication to check a quotient, including any remainder.
  • Estimate a quotient using compatible numbers, such as 1,800 ÷ 20.
  • Decide what a remainder means in a word problem and answer accordingly.

Common misconceptions

Losing count of the partial quotients

Students who subtract several chunks of the divisor sometimes forget to add up the multiples they used. Recording each multiple in a column beside the work fixes this.

Treating the remainder as the answer to every story

If 350 students ride buses that hold 48, the quotient 7 remainder 14 means 8 buses are needed. The context decides whether to round up, drop or report the remainder.

Using only single-digit thinking

Students may try to divide 1,728 by 2 and then by 4 separately, as if dividing by 24 were two separate steps on digits. Estimating with multiples of 24 keeps the divisor whole.

Not checking the size of the answer

A quotient of 7 for 1,728 ÷ 24 should feel wrong, since 24 × 7 is under 200. A quick estimate (about 1,700 ÷ 25 ≈ 70) catches it.

Worked example: 1,728 ÷ 24 with partial quotients

Find 1,728 ÷ 24 and check the answer by multiplication.

  1. Estimate: 24 is close to 25, and 1,728 is close to 1,750, so the quotient should be near 70.
  2. Take out 50 groups of 24: 24 × 50 = 1,200. That leaves 1,728 - 1,200 = 528.
  3. Take out 20 groups of 24: 24 × 20 = 480. That leaves 528 - 480 = 48.
  4. Take out 2 groups of 24: 24 × 2 = 48. That leaves 0.
  5. Add the groups: 50 + 20 + 2 = 72. Check: 24 × 72 = 1,728.

Answer: 1,728 ÷ 24 = 72.

Teaching 5.NBT.B.6

Give students a short list of easy multiples of the divisor (×1, ×2, ×5, ×10, ×20, ×50) before they divide. This makes partial quotients efficient and shows how the strategy rests on multiplication facts they already know.

Tests typically ask for a quotient, ask which model or equation represents a division, or embed division in a context with a remainder that must be interpreted, such as packing items into boxes.

6 practice questions

Original questions written for this standard. Choose an option or type your answer, then press Check. Every question has a worked explanation.

Score: 0 / 6(0 of 6 checked)
  1. 1.

    Calculate 936 ÷ 12.

    Answer and explanation

    Answer: 78

    12 × 70 = 840, leaving 96. 12 × 8 = 96. So the quotient is 70 + 8 = 78.

  2. 2.

    Calculate 2,475 ÷ 33.

    Answer and explanation

    Answer: 75

    33 × 70 = 2,310, leaving 165. 33 × 5 = 165. So 2,475 ÷ 33 = 75.

  3. 3.

    What is 1,000 ÷ 16?

    Question 3 options
    Answer and explanation

    Answer: D) 62 remainder 8

    16 × 60 = 960, leaving 40. 16 × 2 = 32, leaving 8. So 1,000 ÷ 16 = 62 remainder 8. Check: 16 × 62 + 8 = 1,000.

  4. 4.

    A school needs to take 350 students on buses that each hold 48 students. How many buses are needed?

    Question 4 options
    Answer and explanation

    Answer: A) 8

    350 ÷ 48 = 7 remainder 14. Seven buses leave 14 students without a seat, so 8 buses are needed.

  5. 5.

    A farmer packs 1,296 eggs into cartons of 18. How many cartons are filled?

    Answer and explanation

    Answer: 72 (also accepted: 72 cartons)

    18 × 70 = 1,260, leaving 36. 18 × 2 = 36. So 70 + 2 = 72 cartons.

  6. 6.

    Which estimate best checks 2,385 ÷ 41?

    Question 6 options
    Answer and explanation

    Answer: C) 2,400 ÷ 40 = 60

    Rounding to compatible numbers gives 2,400 ÷ 40 = 60. The exact quotient is about 58, so the estimate is close.

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FAQ

Do fifth graders have to use long division for 5.NBT.B.6?

No. The standard asks for strategies based on place value, properties and the multiplication link, illustrated with equations, arrays or area models. Fluency with the standard division algorithm is expected in sixth grade (6.NS.B.2).

Are remainders part of this standard?

Yes. Quotients are whole numbers, so many problems have remainders, and word problems ask students to decide what the remainder means.

More grade 5 Number & Operations in Base Ten standards

5.NBT.A.1: Place value: ten times and one tenth5.NBT.A.2: Powers of 10 and exponents5.NBT.A.3: Reading, writing and comparing decimals5.NBT.A.4: Rounding decimals5.NBT.B.5: Multi-digit multiplication (standard algorithm)5.NBT.B.7: Operations with decimals to hundredths
All Grade 5 math standards →Standards home →