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Question
Alex bought 100 candies, so that he can give 3 candies each to 46 of his friends. How many extra candies (rouned off to the nearest 10) does he have to buy?
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Solution
Number of candies Alex bought = 100
Number of candies he wants to distribute = 3 × 46
= 46 + 46 + 46
= 138
Number of extra candies he needs to buy = 138 - 100 = 38
Rouding off to the nearest 10:
As the ones digit of 38 that is 8, is greater than 5, it will be rounded off to 40.
Hence Alex needs to buy 40 candies more.
Number of candies he wants to distribute = 3 × 46
= 46 + 46 + 46
= 138
Number of extra candies he needs to buy = 138 - 100 = 38
Rouding off to the nearest 10:
As the ones digit of 38 that is 8, is greater than 5, it will be rounded off to 40.
Hence Alex needs to buy 40 candies more.
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