Adding tens up to 100

At the swimming pool – Addition and subtraction of tens

Count by 10s No.1

Adding and subtracting 10s - No.1

Adding and subtracting 10s - No.2

Adding and subtracting 10s - No.4

Adding tens to two digit numbers

Adding and subtracting 10s - No.5

Subtracting tens up to 100 No.5

Adding tens No.4

Count by 10s No.2