Use this method to find the following products: Is this quicker than the multiplication procedure you use generally? Class 7
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Use this method to find the following products: Is this quicker than the multiplication procedure you use generally? Class 7
Question 1.
Use this method to find the following products:
(a) 95 × 8
(b) 104 × 15
(c) 49 × 50
Is this quicker than the multiplication procedure you use generally?
Solution:
(a) 95 × 8 = (100 - 5) × 8
= 100 × 8 - 5 × 8
= 800 - 40 = 760
(b) 104 × 15 = (100 + 4) × 15
= 100 × 15 + 4 × 15
= 1500 + 60 = 1560
(c) 49 × 50 = (50 - 1) × 50
= 50 × 50 - 1 × 50
= 2500 - 50 = 2450.
Yes.
Question 2.
Which other products might be quicker to find like the ones above?
Solution:
Do as directed. For example, 1001 × 17, 999 × 15, etc.