Partition numbers in different ways

1. 15

55 is 5 tens and 5 ones.

40 uses only 4 tens, so 1 ten is left over with the 5 ones.

1 ten and 5 ones make 15, so 55 = 40 + 15.

2. 14

64 is 6 tens and 4 ones.

50 uses only 5 tens, so 1 ten is left over with the 4 ones.

1 ten and 4 ones make 14, so 64 = 50 + 14.

3. 17

57 is 5 tens and 7 ones.

40 uses only 4 tens, so 1 ten is left over with the 7 ones.

1 ten and 7 ones make 17, so 57 = 40 + 17.

4. 17

87 is 8 tens and 7 ones.

70 uses only 7 tens, so 1 ten is left over with the 7 ones.

1 ten and 7 ones make 17, so 87 = 70 + 17.

5. 18

48 is 4 tens and 8 ones.

30 uses only 3 tens, so 1 ten is left over with the 8 ones.

1 ten and 8 ones make 18, so 48 = 30 + 18.