Short Blocks

# Maths Year 3 Autumn Multiplication and Division (B)

Each unit has everything you need to teach a set of related skills and concepts.

## Mental strategies for x and ÷(suggested as 2 days)

### Planning and Activities

Day 1 Teaching
Children write x2 table on left hand side of w/bs. Children now write the corresponding 4x table on right hand side. Note that in order to work out x4 a number, you can double it twice. Model for larger numbers. 13 x 4 ≡ double 26.
Group Activities
-- Practising multiplying by 4.
Day 2 Teaching
Ask children how to multiply a number by 4. Agree you can double twice. We use this to divide by 4. Show example on IWB, reminding children that halving is the inverse of doubling. So we can divide by 4 by halving twice.
Group Activities
Use the ‘Does It or Not?’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
-- Practising dividing by 4.

### You Will Need

• 4 times table (see resources)
• x2 & x4 times tables (see resources)
• 1-24 number cards
• Multiplying & dividing by 4 (see resources)
• Multiple of 4 cards (see resources)

### Mental/Oral Maths Starters

Day 1
Double 2-digit numbers (pre-requisite skills)

Day 2
Halve even 2-digit numbers (pre-requisite skills)

### Worksheets

Day 1
Multiply by 4: differentiated sets.

Day 2
Divide by 4: colour coded questions.

### Mastery: Reasoning and Problem-Solving

• Multiply 26 by 4. WOW!
• Write 4 sentences to link the numbers 24, 4 and 96.
• What mistake has Fred made in his calculations ?
13 x 4 = 26
21 x 4 = 42
56 ÷ 4 = 28
64 ÷ 4 = 32
• Divide 128 by 4.
Can you divide the answer by 4?
Can you divide that answer by 4?

In-depth Investigation: Does It or Not?
Children find numbers between 50 and 100 which they can divide by 4. They halve each number twice to find out.

### Catch-up Learning

This unit has no separate Extra Support activities.