Unit 13 – Number fluency
Let’s Practise Complete the calculations. 10 − 3 =
20 − 3 =
20 − 13 =
10 − 8 =
20 − 8 =
20 − 18 =
10 −
= 4
20 −
= 4
20 −
= 14
10 −
= 5
20 −
= 5
20 −
= 15
Start with 20 pebbles or counters. Take away 1, 2 or 3.
I will take away 2.
Now it is your partner’s go. They choose to take away 1, 2 or 3. If you take the last pebble, you win!
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