1 ten + 5 ones =
15
9 tens + 9 ones ( 90 + 9 )
99
1 ten + 6 ones ( 10 +6 )
16
2 tens + 7 ones ( 20 + 7 )
27
9 ones - 7 ones ( 9 - 7 )
2
7 ones - 2 ones ( 7 - 2 )
5
skip counting by 10s
very good
skip counting by 5s
well done
