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