Multiplying numbers by 10 and 100
1 We can use what we know about place value to help us multiply numbers by 10. 12 × 10 = 120 because 12 is made 10 times as big. The digits move 1 place to the left. 2 We can also use place value to multiply numbers by 100. 12 × 10 2 0 1 2 1
9 × 100 9 0
9
0
Can you explain why we use two zeros as place holders when we multiply by 100?
Multiply each of these numbers by 10. 20 18 23 34 42 50 Multiply each of these numbers by 100. 8 6 1 3 5 7
1
2
Use a calculator to practise multiplying 2-digit numbers by 10. Can you predict the answer before you press the ‘= ’ button?
150
9781380050687__text.indb 150
03/05/2022 10:19
Made with FlippingBook Learn more on our blog