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How to multiply and divide by 0, 1, 10 and 100 | Year 4 Mathematics PDF Download

Multiplying by 1, 10, or 100

  • When you multiply any number by 1, the result remains the same.
    • For example: 21 × 1 = 21
  • Multiplying by 10 involves shifting all digits to the left, adding a zero at the end.
    • For example: 21 × 10 = 210
  • Multiplying by 100 requires shifting all digits two places to the left, adding zeros as needed.
    • For example: 21 × 100 = 2100

How to multiply and divide by 0, 1, 10 and 100 | Year 4 Mathematics

Question for How to multiply and divide by 0, 1, 10 and 100
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What happens when you multiply any number by 1?
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Multiplying by 0

  • Any number multiplied by 0 equals 0.
  • For instance: 5 × 0 = 0
  • Another example: 100 × 0 = 0
  • Similarly, 9456 × 0 = 0
  • Consider: What is 1,000,000 × 0?

How to multiply and divide by 0, 1, 10 and 100 | Year 4 Mathematics

Dividing by 1, 10 or 100

  • When you divide by 1, the result remains the same.
    • Example: 21 ÷ 1 = 21
  • When you divide by 10, shift all digits one place to the right.
    • Example: 210 ÷ 10 = 21
  • When you divide by 100, shift all digits two places to the right.
    • Example: 2100 ÷ 100 = 21

How to multiply and divide by 0, 1, 10 and 100 | Year 4 Mathematics

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