Study

MULTIPLICATION & DIVISION

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  • The school has 72 children in 3 equal classes. How many in each class?
    72 : 3 = 36
  • 19 x 5 = .... (use mental method)
    10 x 5 = 50 --> 9 x 5 = 45 --> 50 + 45 = 95
  • 27 : 5 = ....
    5 remainder 2
  • 32 x 3 = .... (use written column method)
    see the whiteboard
  • 52 : 3 = .... (use column method)
    17 remainder 1
  • 36 : 3 = .... (use mental method)
    30 : 3 = 10, 6 : 3 = 2 ---> 10 + 2 = 12
  • Tennis balls come in packs of 4. There are 12 packs. How many balls in total?
    12 x 4 = 48
  • 45 x 5 = .... (use written column method)
    see the whiteboard
  • 84 : 4 = ....
  • A large box has a mass of 21 kg. What is the mass of 4 boxes? (use mental method)
    21 x 4 --> 20 x 4 = 80 , 1 x 4 = 4 --> 80 + 4 = 84 kg
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