Three pencils cost 75p altogether. How much will it cost to buy 6 pencils?
Answer (3)
The cost for six pencils would be a total of 150p The reason why is if three pencils cost 75p and you want to know what the cost of six, since three is half of six you would do this (if 3=75p then 3 2=75p 2 which is 6=150p). As shown, you multiply each side by 2 or double each side
Cost of 3 pencils = 75p Cost of 1 pencils = 75/3 Cost of 6 pencils = [75/3] 6 = 75 2 = 150p.
The cost to buy 6 pencils is 150p. This is calculated by first determining the cost of one pencil, which is 25p, then multiplying that by 6. Hence, 6 pencils cost 6 x 25p = 150p.
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