Addition & subtraction

Practise this line

1
To tenBonds to ten, partitioning, counting back, and addition and subtraction to ten.
- Bonds to ten
- Partitioning to ten
- Counting back to ten
- Addition within ten
- Subtraction within ten
Explanation: Bonds to ten · How many more are needed? · How many to subtract for ten? · Start with the larger number · Think of addition
From year 3 · 53
2
Split housesSplitting to 10 and teen numbers in the split house.
- Split houses to 10
- Split houses and teen numbers
Explanation: Friends of 10 in the split house · Split into two rooms
From year 3 · 24
3
Doubles and halvesDoubles, near doubles, and halving back.
- Doubles and halves
Explanation: Use doubles you know
From year 3 · 24
4
To twentyTen and ones, and adding and subtracting within twenty without bridging.
- Partitioning to twenty
- Addition within twenty
- Subtraction within twenty
Explanation: Numbers above ten are ten and ones · Add to the ten · Take away from the ones
From year 3 · 42
5
The counting frameCounting beads and sums with the 5- and 10-structure.
- Counting frame to 10
- Counting frame to 20
Explanation: Look at the 5 red and 5 white beads · First the full top bar of 10
From year 3 · 25
6
Bus problemsGetting on and off: adding and subtracting with the bus.
- Bus problems: getting on
- Bus problems: getting off
Explanation: Count who gets on · Count who gets off
From year 2 · 32
7
Vanishing sumsTaking everything or almost everything away: answer 0 or 1.
- Vanishing sums and almost-vanishing
Explanation: Everything or almost everything away
From year 3 · 16
8
Bridging tenThe big step: adding and subtracting bridging ten, up to twenty.
- Addition bridging ten
- Subtraction bridging ten
Explanation: Make ten first · Bridge through ten
From year 3 · 24
9
To a hundredJumps of ten, and addition and subtraction within tens.
- Jumps of ten and one
- Addition within a hundred
- Subtraction within a hundred
- Bonding to the next ten
Explanation: Jumps of ten and one · Tens and ones separately · Making up to a round number
From year 4 · 60
10
Quick methodsCompleting to 100 and 1000, calculating with 9, 19, 29 and with 25 and 50.
- Completing to one hundred
- Quick methods with 9, 19, 29
- Completing to one thousand
- Calculating with 25 and 50
Explanation: Making up to a round number · Calculate with the round number, then adjust · Think in quarters and halves
From year 5 · 41
11
Bridging tensAddition and subtraction bridging tens: 76 + 8.
- Addition bridging tens
- Subtraction bridging tens
Explanation: Bridge through the ten
From year 4 · 24
12
Tens and onesThe next step: 56 + 28 and 76 − 28.
- Addition with tens and ones
- Subtraction with tens and ones
Explanation: Tens first, then ones · Take away the tens first
From year 5 · 24
13
To a thousandAddition and subtraction up to a thousand, and spotting when counting on is quicker.
- Addition to a thousand
- Subtraction to a thousand
- Difference: counting on
Explanation: Calculate in round steps · Close numbers? Count on
From year 5 · 36
14
Large numbersAddition and subtraction with numbers above one thousand.
- Addition with large numbers
- Subtraction with large numbers
Explanation: Counting with zeros
From year 6 · 24