Multiply a 3-digit by a 1-digit number with one or two regroups | Maths

Starter quiz

What’s the next number in the sequence: 11, 22, 33, ___

34

44 ✓

54

64
Look at the short multiplication. ___ tens have been regrouped.

'2' ✓
Look at the expanded multiplication. ______ tens have been regrouped.

'3' ✓
Select the representation which shows: 42 × 3

Pic 1

Pic 2

Pic 3 ✓

Pic 4
Use a formal or informal method to solve this word problem: If all these boxes are the same height, how tall is the stack of boxes?

'93 cm' ✓
Find the missing number.

'6' ✓

Which multiple is the odd one out?

5

7 ✓

10

15

20
Select the correct expanded arrangement for:

Pic 1 ✓

Pic 2

Pic 3
Which multiplication will need regrouping in the ones column only?

323 × 3

325 × 3 ✓

323 × 2

303 × 3
Use expanded multiplication to solve: 422 × 4. Write the product in numeral form.

'1688' ✓
Use short multiplication to solve: 406 × 6. Write the product in numeral form.

'2,436' ✓
What could the missing number be?

'5' ✓

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If the product of the ones digits is greater than 10 then you regroup ten ones into one ten.
If the product of the 1-digit number and the tens digit is greater than 100 then you regroup ten 10s into one 100
If the product of the 1-digit number and the 100s digit is greater than 1,000 then you regroup ten 100s into one 1,000

Children may misalign digits when arranging into the short multiplication layout.

Children should use unitising language to help them understand and apply this to formal written methods.

Regroup - The process of unitising and exchanging between place values is known as regrouping.
Expanded multiplication - A way of recording the steps of a calculation focusing on partitioning one or more factors and showing partial products.
Short multiplication - A way of recording using columns to set out and calculate a multiplication.