Subtraction Wednesday

Today we will be doing some more work on subtraction.

• 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 try and count backwards from 30.

• Primary 2’s try and count backwards from 100.

• Watch these videos to help you:

Main Task:

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

• Primary 1 sums are in red and Primary 2 sums are in orange.

Primary 1	Primary 2
1 – 1 =	23 – 1 =
4 – 2 =	17 – 2 =
5 – 3 =	30 – 3 =
7 – 4 =	16 – 4 =
9 – 3 =	13 – 5 =
19 – 0 =	26 – 0 =
10 – 3 =	17 – 4 =
11 – 4 =	21 – 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:

·         8 – ? = 7	·         7 – ? = 3	·         12 – ? = 10
·        10 – ? = 8	·         5 – ? = 2	·         14 – ? = 11

Game to Support Learning: 

• Play the games below to practise your addition and subtraction.

• Click on the + or the – train: Mental Maths Train

• Minus Mission