Week beginning February 18th – Foundation to Year 2
Pairs of Numbers
If you have ten counters numbered 1 to 10, how many can you put into pairs that add to 10?
Can you use them all?
How did you get your answer?
Now put the counters into pairs to make 12.
- Can you use them all?
- Say how you got your answer.
Now put the counters into pairs to make 13.
- Can you use them all?
- Say how you got your answer.
Pairs that make 10 are 1+9, 2+8, 3+7, 4+6
Eight counters were used. Counters 10 and 5 were not used.
Pairs that make 12 are 2+10, 3+9, 4+8, 5+7
Eight counters were used. Counters 1 and 6 were not used.
Pairs that make 13 are 3+10, 4+ 9, 5+8, 6+7
Eight counters were used. Counters 1 and 2 were not used.
Pairs that make 11 are 1+10, 2+9, 3+8, 4+7, 5+6
Ten counters were used. All counters were used.