Carrying and Checking in Column Multiplication

Mathematics · Multiplication & Division · ages 8-9

Name ______________________ Date ____________

To start 47 x 6, what is 7 x 6?
- 40
- 13
- 42
- 35
What is 32 x 3?
- 93
- 96
- 86
- 90
When you multiply 8 x 7 in the ones column and get 56, what do you write and what do you carry?
- Write 5, carry 6
- Write 6, carry 5
- Write 56, carry 0
To estimate 234 x 5, you can round 234 to 200 first.
Circle one: True False
Owen estimated 234 x 5 as 200 x 5 = 1000. Is his estimate sensible?
Circle one: True False
Which estimate helps you check 482 x 4?
- 500 x 4 = 2000
- 400 x 40 = 16000
- 482 x 40 = 19280
To start 234 x 5, what is 4 x 5?
- 16
- 24
- 15
- 20
What is 58 x 4?
Answer: ______________
Ravi worked out 347 x 6 and got 1842, forgetting to add a carried ten. Is 1842 too big or too small compared to the correct answer?
- Too big
- Exactly right
- Too small
A machine shows 47 x 6 = 2820. Priya says that cannot be right because 50 x 6 is only 300. Is Priya right?
Circle one: True False

Answer key

For grown-ups. Fold this page away before handing over the rest.

42 · 42 is right: 7 ones times 6 gives 42 ones, so write 2 and carry 4.
96 · 96 is right because 30 x 3 = 90 and 2 x 3 = 6, totalling 96.
Write 6, carry 5 · 56 means 5 tens and 6 ones, so you write the 6 and carry the 5 tens.
True · Rounding to a nearby friendly number makes the estimate quick to work out in your head.
True · Owen is right: 234 is near 200, so 1000 is a sensible rough answer.
500 x 4 = 2000 · Round 482 to the nearest hundred, 500, then multiply by 4 for a quick estimate: 2000.
20 · 20 is right: 4 ones times 5 gives 20 ones, so write 0 and carry 2.
232 · 58 x 4 = 232.
Too small · Missing a carried ten means some value never gets added in, so the total comes out smaller than it should.
True · Priya is right: 47 x 6 is near 300, so 2820 is ten times too big.