Find 50%, 25%, 10%, 5% and 1% mentally
6th grade (Year 7 in England) · 16 questions · Common Core: 6.RP.A.3.C · England: KS3 Number, GCSE Foundation Number
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Question 1
Find 50% of 400 in your head.
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Question 2
Lucia says: “15% of 240 is 10% of 240 plus 5, so it is 29.” What is 15% of 240 really?
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Question 3
Find 55% of 540 by building it from 10% and 5%.
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Question 4
Find 20% of 380 in your head.
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Question 5
Kofi says: “15% of 400 is 10% of 400 plus 5, so it is 45.” What is 15% of 400 really?
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Question 6
Find 60% of 720 by building it from 10% and 5%.
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Question 7
Find 1% of 740 in your head.
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Question 8
Kofi says: “15% of 140 is 10% of 140 plus 5, so it is 19.” What is 15% of 140 really?
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Question 9
Find 15% of 160 by building it from 10% and 5%.
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Question 10
Find 50% of 100 in your head.
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Question 11
Daniel says: “15% of 100 is 10% of 100 plus 5, so it is 15.” What is 15% of 100 really?
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Question 12
Find 15% of 660 by building it from 10% and 5%.
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Question 13
Find 10% of 40 in your head.
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Question 14
Mei says: “15% of 460 is 10% of 460 plus 5, so it is 51.” What is 15% of 460 really?
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Question 15
Find 30% of 280 by building it from 10% and 5%.
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Question 16
Find 75% of 520 in your head.
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