Subtraction Wednesday

• Remember when we subtract the number always gets smaller; we count backwards.

• Minus, take-away, less than and subtract all mean the same thing.

Warm Up:

• Primary 1’s: can you write your numbers backwards from 20?

• Primary 2’s: can you write your numbers backwards from 100?

• Watch these videos to help you:

Main Task:

• Write down your subtraction sums in your jotter and then answer them.

• Remember to put the big number in your pocket and count back the small number using your fingers or use a number line to help you.

Primary 1	Primary 2
9 – 1 =	24 – 1 =
7 – 2 =	18 – 2 =
6 – 3 =	16 – 3 =
8 – 4 =	20 – 4 =
10 – 3 =	12 – 5 =
18 – 0 =	15 – 0 =
15 – 3 =	9 – 4 =
12 – 4 =	10 – 4 =

Extra Challenge: 

• Can you answer these tricky missing number sums?

• Put the number in your pocket and count back using your fingers until you reach the answer. How many fingers did you need?

• Remember they are take away sums:

·         9 – ? = 8	·         5 – ? = 3	·         3 – ? = 1
·        12 – ? = 10	·         6 – ? = 2	·         11 – ? = 8

Game to Support Learning:

• Play the games below to practise your subtraction.

• Minus Mission

• Click on the – train: Mental Maths Train