Grade 4 · Math · Division

4th Grade Long Division Error Detective worksheets

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Long Division Error Detective

Grade 4 Math Worksheet - Building Confidence

NameDate

Circle the step with the mistake.

1.
Nora divided 698 ÷ 3 and made one mistake. Which step has the mistake?
- Step 1: 6 ÷ 3 = 2, 2 × 3 = 5, 6 − 5 = 1
- Step 2: bring down 9, 19 ÷ 3 = 6, 6 × 3 = 18, 19 − 18 = 1
- Step 3: bring down 8, 18 ÷ 3 = 6, 6 × 3 = 18, 18 − 18 = 0
2.
Priya divided 338 ÷ 4 and made one mistake. Which step has the mistake?
- Step 1: 33 ÷ 4 = 8, 8 × 4 = 32, 33 − 32 = 1
- Step 2: bring down 8, 18 ÷ 4 = 4, 4 × 4 = 16, 18 − 16 = 3
3.
Jules divided 829 ÷ 3 and made one mistake. Which step has the mistake?
- Step 1: 8 ÷ 3 = 2, 2 × 3 = 6, 8 − 6 = 2
- Step 2: bring down 2, 22 ÷ 3 = 7, 7 × 3 = 21, 22 − 21 = 1
- Step 3: bring down 9, 19 ÷ 3 = 6, 6 × 3 = 19, 19 − 19 = 0
4.
Leo divided 771 ÷ 4 and made one mistake. Which step has the mistake?
- Step 1: 7 ÷ 4 = 1, 1 × 4 = 4, 7 − 4 = 0
- Step 2: bring down 7, 7 ÷ 4 = 1, 1 × 4 = 4, 7 − 4 = 3
- Step 3: bring down 1, 31 ÷ 4 = 7, 7 × 4 = 28, 31 − 28 = 3
5.
Leo divided 836 ÷ 4 and made one mistake. Which step has the mistake?
- Step 1: 8 ÷ 4 = 2, 2 × 4 = 8, 8 − 8 = 0
- Step 2: bring down 3, 3 ÷ 4 = 0, 0 × 4 = 0, 3 − 0 = 3
- Step 3: bring down 6, 36 ÷ 4 = 9, 9 × 4 = 35, 36 − 35 = 1
6.
Leo divided 244 ÷ 4 and made one mistake. Which step has the mistake?
- Step 1: 24 ÷ 4 = 6, 6 × 4 = 24, 24 − 24 = 0
- Step 2: bring down 4, 4 ÷ 4 = 1, 1 × 4 = 4, 4 − 4 = 1

4th Grade Long Division Error Detective worksheet 1 – printable PDF — Download PDF: 1 2 3 4 5 6

About this worksheet

Finding a mistake in someone else's long division is one of the best ways to learn the steps. Each problem here shows how a student divided, one step at a time, and exactly one step has a mistake: a wrong product, a wrong subtraction, or a digit that is not the next digit of the number being divided. Check each step by multiplying back and subtracting, compare the digit brought down with the original number, and circle the step that went wrong.

What your child will learn

Check each step of a long division
Multiply back to test a quotient digit
Check a subtraction
Check the digit that was brought down

Common Core standard: 4.NBT.B.6

Worked example

In 156 ÷ 6, a step that says 6 × 2 = 14 is wrong, because 6 × 2 = 12.

Common mistake

Checking only the answer at the end and not each step.

Helpful hint

Check each step: multiply back, subtract, and make sure the digit brought down is the next digit of the dividend.

Next skill: Order of Operations Earlier: Divide With Remainders

Questions parents ask

What is the most common mistake with long division error detective?

Checking only the answer at the end and not each step.

How can I help my child with long division error detective?

Check each step: multiply back, subtract, and make sure the digit brought down is the next digit of the dividend.

Are these 4th grade math worksheets free to print?

Yes. All 6 printable versions on this page are free to download and print, with no account needed.

More 4th grade division

See all division

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