Page 11 - NUMINO Challenge_C2
P. 11
1 Various Methods of Multiplication
Basic Concepts Multiplication: The Easy Way
1. 4 is the same as multiplying by 2 twice. 5 is the same as
dividing by 2 followed by multiplying by 10. 15 is the same as
adding half of to followed by multiplying by 10.
36 4 36 2 2 72 2 144
36 5 36 2 10 18 10 180
36 15 (36 18) 10 54 10 540
2. Use the multiplication results to make 10, 100, and 1000. Then do the
other calculations.
Example Solve each problem using the easy way of multiplication.
25 32 125 102 43
Class Notes
In , 32 4 .
Therefore, 25 32 125 25 4 125
In , 102 43 (100 2) 43 4,300 .
Try It Again Solve each problem using the easy way of multiplication.
5 32 125 125 79
8 NUMINO Challenge C2
Basic Concepts Multiplication: The Easy Way
1. 4 is the same as multiplying by 2 twice. 5 is the same as
dividing by 2 followed by multiplying by 10. 15 is the same as
adding half of to followed by multiplying by 10.
36 4 36 2 2 72 2 144
36 5 36 2 10 18 10 180
36 15 (36 18) 10 54 10 540
2. Use the multiplication results to make 10, 100, and 1000. Then do the
other calculations.
Example Solve each problem using the easy way of multiplication.
25 32 125 102 43
Class Notes
In , 32 4 .
Therefore, 25 32 125 25 4 125
In , 102 43 (100 2) 43 4,300 .
Try It Again Solve each problem using the easy way of multiplication.
5 32 125 125 79
8 NUMINO Challenge C2
