# Maths Year 3/4 Autumn More Addition & Subtraction

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

## +/- near-/multiples of 10, 100, 1000(suggested as 4 days)

### Planning and Activities

Day 1 Teaching
Use place value to add multiples of 1, 10, 100 to 2-digit and 3-digit numbers.
Further Teaching with Y4
Place value additions with up to 4-digits.
Group Activities: T with Y4
Y3 -- Add multiples of 1s, 10s (and 100s) to 3-digit numbers.
Y4 -- Use place value and number facts to add 3-digit and 4-digit numbers.

Day 2 Teaching
Add near multiples of 10 to 2 and 3-digit numbers.
Group Activities: T with Y3
Use the in-depth problem-solving investigation for this unit ‘Magic 147’ as today’s group activity.
Or, use these activities:
Y3 -- Hexagon Multiples addition game: add multiples of 10 and related near multiples.
Y4 -- Solve and make up word problems involving adding multiples and near multiples of 10 or 100 to a 3-digit number.

Day 3 Teaching
Use place value to subtract multiples of 1, 10, 100 from 2-digit and 3-digit numbers (Y4 4-digits).
Further Teaching with Y3
More guided practice on whole-class teaching.
Group Activities: T with Y3
Y3 -- Subtract 1s, 10s and 100s from 3-digit numbers.
Y4 -- Subtract multiples of 1, 10 and 100 from 3-digit and 4-digit numbers.

Day 4 Teaching
Subtract near multiples of 10 and 100 from 2 and 3-digit numbers.
Group Activities: T with Y3
Y3 -- Subtract multiples of 10 and related near multiples.
Y4 -- Use an empty number line to subtract near multiples of 10 and 100 from 3-digit numbers.

### You Will Need

• ‘Place value grid’ (see resources)
• ‘Adding using place value’ sheets 1 and 2 (see resources)
• Coins (£1s, 10ps and 1ps)
• Whiteboards and pens
• 1–6 dice, 1–8 dice and 3-minute sand timer
• ITP: Number spinners (see resources)
• ‘Hexagon Multiples Addition Game’ boards A and B plus cards (see resources)
• ‘Word Problems’ sheet (see resources)
• ‘Cake cards’ sheets 1 to 4 (see resources)
• ‘Hexagon Multiples Subtraction Game’ (see resources)
• ‘Subtracting multiples of 10/100 and multiples of 10/100 + 1, – 1’ sheets 1 to 3 (see resources)
• Pencils and paperclips (to use with spinners)

### Short Mental Workouts

Day 1
Add any pair of 1-digit numbers

Day 2
Add/subtract 10/100 to/from 3-digit and 4-digit numbers

Day 3
Add/subtract multiples of 10 to or from any 2-digit number

Day 4
Count on and back in 10s from a 3-digit number

### Worksheets

Day 1
Y3: Add multiples of 1s, 10s and 100s to 3-digit numbers.
Y4: Use place value to add to 3- and 4-digit numbers.

Day 2
Y3: Add multiples of 10 and near multiples.
Y4: Add multiples of 10 and 100 and multiples + 1, – 1.

Day 3
Y3: Subtract multiples of 1s, 10s and 100s from 3-digit numbers; some worded problems.
Y4: Place value subtractions from 3- and 4-digit numbers.

Day 4
Y3: Subtract multiples of 10 and near multiples.
Y4: Subtract multiples and near multiples of 10 and 100; 100 and 1000.

### Mastery: Reasoning and Problem-Solving

Y3

• Use number cards 9, 1, 5 and 7. How many additions of near multiples can you create?
• Mystery number
What ONE number makes this sentence true?
76 – ? = 18 + ?
• How many times will you add 19 to 24 to reach 100? What number will you start with if you add 18 repeatedly and reach 100 exactly?

Y4

• Complete this sequence by adding 198 each time.
169, 367, ___, 763, ___, ___
• What needs to be subtracted from 985 to get 587?
• Harry subtracted 59 from 354 and got 293. Explain what he did wrong.
• Complete the number sentences:
438 + 39 = ___
356 – ___ = 307
___ – 198 = 314

In-depth Investigation: Magic 147
Children arrange the ‘nearly numbers’ in a square so that each row and column adds to ‘Magic 147’.

Y3
Jolly Jumping