Short Blocks

# Maths Year 3/4 Spring Addition & Subtraction (B)

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

## Column addition(suggested as 4 days)

### Planning and Activities

Day 1 Teaching
Remind children how to use expanded addition to calculate 728 + 153, leaving a line above the answer for the extra tens, then modelling 567 + 158 showing how we need to add an extra 10 and 100. Repeat for trios of numbers, first estimating the totals.
Group Activities: T with Y3
Y3 -- Use expanded addition to add two 3-digit numbers. Some children will begin to use compact addition.
Y4 -- Apply compact addition skills to add trios (or pairs) of 3-digit numbers, aiming for given target totals.

Day 2 Teaching
Use both expanded and compact column addition to calculate the same addition. Children try each method, then say which they prefer.
Further Teaching with Y4
Group Activities: T with Y4
Use the ‘Next door additions’ in-depth problem-solving investigation below as today’s group activity.
Or, use these activities:
Y3 -- Target totals: make additions with a total less than 500 and more than 500. Some children will use expanded addition; others will use compact addition. They then choose their preferred layout to calculate other additions.
Y4 -- Add pairs of amounts of money using expanded and then compact addition.

Day 3 Teaching
Use IWB £1, 10p and 1p coins to show addition of pennies, then 10p coins to amounts on a place value grid, crossing multiples of 10p and £1. Show how to use expanded and compact addition to add amounts of money (1p coins >10p, 10p coins >£1).
Group Activities: T with Y3
Y3 -- Add multiples of 1p and 10p to given prices.
Y4 -- Use expanded addition and compact addition to add amounts of money. Some children will rank calculations in order of difficulty; explain reasoning.

Day 4 Teaching
Use IWB £1, 10p and 1p coins to show addition of 10p, 20p and 4p to prices.
Further Teaching with Y4
Group Activities: T with Y4
Y3 -- Use place value grids to help add multiples of 10p to given prices. Some children will count on in tens to add multiples of 10p.
Y4 -- Apply compact addition skills to add pairs/trios of 3-digit amounts of money.

### You Will Need

• Hundreds, tens and ones place value cards
• ‘Adding two 3-digit numbers’ sheet (see resources)
• Number cards 1–9
• ‘Adding amounts of money’ activity sheet (see resources)
• ‘On board practice 1 and 2’ (see resources)
• 1p, 10p and £1 coins
• ‘Money place value grid’ (see resources)
• IWB coins
• 1–6 dice and 0–9 dice
• ‘On board practice 2’ (see resources)
• ‘Adding money’ sheet (see resources)
• Books with price labels: £4.79, £5.49, £5.25, £4.65, £4.29

### Short Mental Workouts

Day 1

Day 2

Day 3
Count in steps of 20

Day 4
Money place value

### Worksheets

Day 1
Y3: Practise using expanded addition to add pairs of 3-digit numbers, moving extra numbers into the tens and/or hundreds column.
Y4: Use a written method to add pairs, or trios, of 3-digit numbers. Estimate answers by rounding numbers to the nearest 10.

Day 2
Y3: Use expanded and compact addition to calculate two answers, then choose preferred layout to calculate other answers.

Day 3
Y3: Add 10p or 1p coins to 3-digit amounts.
Y4: Find missing numbers in column additions of money.

Day 4
Y3: Add multiples of £1, 10p and 1p to 3-digit amounts.
Y4: Use expanded and compact column addition to find totals of pairs of amounts of money. Estimate totals.

### Mastery: Reasoning and Problem-Solving

Y3

• Add four hundred and fifty-six to three hundred and seventy-two.
• What is the total of two hundred and sixty-eight and two hundred and eighty-six?
• Write the missing numbers:
643 + 174 = ☐
☐ – 356 = 238
327 + 258 = ☐
☐ – 426 = 247
• Amit uses 346 Lego pieces in building his model X-wing, and his sister uses 287 in building her Millennium Falcon. How many Lego pieces have they used altogether?

Y4

(i) £5.78 + £4.22
(ii) £2.56 + £7.44
(iii) £3.17 + £6.83
• Is a column addition calculation the most efficient way to find:
£4.99 + £7.46
£8.06 + £8.06
£4.31 + £5.69?
• Write the missing numbers in this calculation:
£4.☐7 + £5.6☐ = £☐.45