Know Your Numbers: Tens and Ones (20-39)
• Introduction

Look at the coins, there are 10p's and 1p's. Can you add the coins together to work out the total amount? Then try to work out which number is missing from the calculation.

Example:

21 = 20 + 1

• Question 1

Can you add the coins together to work out the missing number in the calculation below? Write the number in the box below.

 33 = 30 + ?
• Question 2

Can you add the coins together to work out the missing number in the calculation below? Write the number in the box below.

 37 = 30 + ?
• Question 3

Can you add the coins together to work out the missing number in the calculation below? Write the number in the box below.

 27 = 20 + ?
• Question 4

Can you add the coins together to work out the missing number in the calculation below? Write the number in the box below.

 28 = 20 + ?
• Question 5

Can you add the coins together to work out the missing number in the calculation below? Write the number in the box below.

 22 = 20 + ?
• Question 6

Can you add the coins together to work out the missing number in the calculation below? Write the number in the box below.

 29 = 20 + ?
• Question 7

Can you add the coins together to work out the missing number in the calculation below? Write the number in the box below.

 36 = 30 + ?
• Question 8

Can you add the coins together to work out the missing number in the calculation below? Write the number in the box below.

 21 = 20 + ?
• Question 9