Mathematics
Using the most convenient grouping, find each of the following products :
(i) 5 x 648 x 20
(ii) 8 x 329 x 25
(iii) 8 x 12 x 25 x 7
(iv) 125 x 40 x 8 x 25
Answer
(i) 5 x 648 x 20
⇒ 648 x (5 x 20)
⇒ 648 x 100
⇒ 64,800.
Hence, 5 x 648 x 20 = 64,800.
(ii) 8 x 329 x 25
⇒ 329 x (8 x 25)
⇒ 329 x 200
⇒ 65,800.
Hence, 8 x 329 x 25 = 65,800.
(iii) 8 x 12 x 25 x 7
⇒ (8 x 25) x 12 x 7
⇒ 200 x 12 x 7
⇒ 2400 x 7
⇒ 16,800.
Hence, 8 x 12 x 25 x 7 = 16,800.
(iv) 125 x 40 x 8 x 25
⇒ 125 x 40 x (8 x 25)
⇒ 125 x 40 x 200
⇒ 125 x (40 x 200)
⇒ 125 x 8000
⇒ 10,00,000.
Hence, 125 x 40 x 8 x 25 = 10,00,000.
Related Questions
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