We embark on our new topic yesterday and continued with multiplying of whole numbers by 10s, 100s and 1000s.
Today's concepts are:
- When we multiply a whole number (without any decimals) by 10, we can add a 0 to the back of the number. 12 x 10 = 120
- When we multiply a whole number (without any decimals) by 100, we can add two 0s to the back of the number. 12 = 100 = 1200
- When we multiply a whole number (without any decimals) by 1000, we can add three 0s to the back of the number. 12 x 1000 = 12000
- When we multiply a whole number by groups of tens (e.g 30, 40, 50, 60), we can break the groups of tens up first. 12 x 80 = 12 x 8 x 10 (8 x 10 gives you 80). This breaks the numbers down into smaller and simpler digits for multiplication rather than taking big numbers and multiplying them straightaway. As a result, you will take 12 x 8 which gives you 96 and then multiply 96 by 10 which will give you 960.
Homework:
- Pages 25 - 27 of the workbook
Sincerely,
Mr Nelson Ong
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