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Number Trail Grade 3 / Week 03 / Wednesday
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Week 03 · Divide: share and group

Wednesday

Multiply to divide
// Fair shares and equal groups
⏱ about 15 min

Wednesday: Multiply to divide

Lucy and Hazel the Hedgehog set out chairs for a story time.

"We have 24 chairs and 4 rows," says Hazel.

"How many chairs go in each row?"

Lucy counts her seven spots while she thinks.

"I know 4 times 6 is 24," she says slowly.

"So 24 divided by 4 must be 6!"

Hazel claps her paws. "Multiplying helped you divide."

Learn it: think multiplication

This array has 4 rows of 6.

It shows 4 × 6 = 24.

It also shows 24 ÷ 4 = 6, and 24 ÷ 6 = 4.

A rectangle of unit squares, four rows of six

To divide, ask a multiplication question.

24 ÷ 4 asks: 4 times what is 24?

4 × 6 = 24, so 24 ÷ 4 = 6.

Lengths work the same way.

Cut a 30 inch ribbon into 6 inch pieces.

You get 30 ÷ 6 = 5 pieces.

WHICH FACT HELPS?
  • Read the question.
  • Tap your answer.
Which fact helps you find 24 ÷ 4?
Which fact helps you find 35 ÷ 7?
Which fact helps you find 40 ÷ 8?
Which fact helps you find 81 ÷ 9?
USE THE ARRAY
  • Read the question.
  • Tap your answer.
Dots in three rows of five15 ÷ 3 = ?
A rectangle of unit squares, seven rows of four28 ÷ 7 = ?
A rectangle of unit squares, six rows of eight48 ÷ 6 = ?
A rectangle of unit squares, four rows of nine36 ÷ 4 = ?
MEASURE AND DIVIDE
  • Read the question.
  • Tap your answer.
A 30 inch ribbon is cut into 6 inch pieces. How many pieces?
Hazel pours 40 liters of water into 5 tubs equally. How many liters in each?
Bennie walks 63 kilometers in 7 days, the same each day. How far each day?
A 50 meter path has a lamp every 10 meters. How many 10 meter parts?
ORDER THE QUOTIENTS
  • Find each quotient.
  • Tap them from least to greatest.
11st
22nd
33rd
44th
SentenceTrue or false?
35 ÷ 7 = 5?
48 ÷ 6 = 6?
4 × 9 = 36?
36 ÷ 4 = 9?
WHY THIS EXERCISE6 × 8 = 48, so 48 ÷ 6 = 8.
Try it
Set out 24 spoons or blocks in 4 equal rows.
How many are in each row?
Now set the same 24 in 6 equal rows.
Say a multiplication and a division for each array.
On paper, draw an array for 4 × 5. Write two divisions it shows.

Super thinking! Tomorrow Chris tells a story about sharing.

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