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How to multiply and divide by 0, 1, 10 and 100 | Year 3 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 3 Mathematics

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 3 Mathematics

Question for How to multiply and divide by 0, 1, 10 and 100
Try yourself:
What is 1,000,000 ? 0?
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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 3 Mathematics

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FAQs on How to multiply and divide by 0, 1, 10 and 100 - Year 3 Mathematics

1. How do you count in multiples of 5?
Ans. To count in multiples of 5, start with 5 and then add 5 to each subsequent number. For example, 5, 10, 15, 20, 25, and so on.
2. What is the significance of multiplying and dividing by 0 in mathematics?
Ans. Multiplying any number by 0 results in 0, as anything multiplied by 0 is 0. Dividing by 0, however, is undefined in mathematics.
3. Why is multiplying and dividing by 1 considered the identity operation in mathematics?
Ans. Multiplying any number by 1 results in the same number, as anything multiplied by 1 remains unchanged. Similarly, dividing any number by 1 also results in the same number, hence it is considered the identity operation.
4. How does multiplying and dividing by 10 affect the value of a number?
Ans. Multiplying a number by 10 shifts the decimal point one place to the right, effectively increasing the value by a factor of 10. Dividing a number by 10 shifts the decimal point one place to the left, decreasing the value by a factor of 10.
5. What happens when you multiply and divide by 100 in mathematics?
Ans. Multiplying a number by 100 shifts the decimal point two places to the right, effectively increasing the value by a factor of 100. Dividing a number by 100 shifts the decimal point two places to the left, decreasing the value by a factor of 100.
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