What is 48 × 10?
2
4
8
48 × 10
How many marbles are there in total in the following number of jars? Make estimates first. (a) 2 jars (b) 4 jars (c) 5 jars
1
(d) 6 jars
(e) 10 jars
Winston sketches an array to represent a multiplication problem about length. (a) What multiplication calculation does this array represent? × (b) Make an estimate first and then calculate the answer. (c) Create a word problem about length that Winston could be solving. 10 10 10 10 10 10 10 10 10
2
10 6 10 6 10 6
E
×
is
The answer to
9 6 3 4 5 7 8 1 2 . 0 = + ÷ × −
between 150 and 250. What could the calculation be? Find at least 10 possibilities. How can you use estimates to help you?
196
9781380050687__text.indb 196
03/05/2022 10:20
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