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21 脳 10 multiplication written on paper
Image caption,
21 脳 10 = 210

Multiplying by 1, 10, or 100

  • When you multiply by 1 the answer stays the same. 21 脳 1 = 21
  • When you multiply by 10, move all the digits one place to the left, putting a zero in the empty space. 21 脳 10 = 210
  • When you multiply by 100, move all the digits two places to the left, putting a zero in the empty spaces. 21 脳 100 = 2100
21 脳 10 multiplication written on paper
Image caption,
21 脳 10 = 210
A rectangle character looking confused at the sum 9456 x 0 = 0

Any number multiplied by 0 is 0

  • 5 脳 0 = 0
  • 100 脳 0 = 0
  • 9456 脳 0 = 0
  • What is 1,000,000 脳 0?
A rectangle character looking confused at the sum 9456 x 0 = 0
210 divided by 10 written on grid paper.
Image caption,
210 梅 10 = 21

Dividing by 1, 10 or 100

  • When you divide by 1 the answer stays the same. 21 梅 1 = 21
  • When you divide by 10, move all the digits one place to the right. 210 梅 10 = 21
  • When you divide by 100, move all the digits two places to the right. 2100 梅 100 = 21
210 divided by 10 written on grid paper.
Image caption,
210 梅 10 = 21

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