1. 63 × 18 =
Round of - 63 = 60
18 = 20
Then multiply it 60 × 20 = 1,200
2. 13 × 25 =
Round of - 13 = 10
25 = 30
Then multiply it 10 × 30 = 300
3. 15 × 12
Round of - 15 = 20
12 = 10
Then multiply it 20 × 10 = 200
4. 63 × 22 =
22 = 20
5. 25 × 32 =
Round of - 25 = 30
32 = 30
Then multiply it 30 × 30 = 900
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Answers & Comments
1. 63 × 18 =
Round of - 63 = 60
18 = 20
Then multiply it 60 × 20 = 1,200
2. 13 × 25 =
Round of - 13 = 10
25 = 30
Then multiply it 10 × 30 = 300
3. 15 × 12
Round of - 15 = 20
12 = 10
Then multiply it 20 × 10 = 200
4. 63 × 22 =
Round of - 63 = 60
22 = 20
Then multiply it 60 × 20 = 1,200
5. 25 × 32 =
Round of - 25 = 30
32 = 30
Then multiply it 30 × 30 = 900