Numbers in different forms

Front

What do you get when you add 20 and 3?

Back

23

Front

What is 30 + 7?

Back

37

Front

What is the value of the digit 7 in the number 473?

Back

70

Front

What number is represented by 10 tens and 4 ones?

Back

104

Front

If you have 30 and you need to make 34, what do you add?

Back

4

Front

What is the sum of 15 and 5?

Back

20

Front

What is 50 - 20?

Back

30

Front

What is the value of the digit 4 in the number 842?

Back

400

Front

What is 10 + 10 + 10?

Back

30

Front

What is 25 + 5?

Back

30