Percentages
and Cross Multiplying
1. What is 50% of 90?
Answer:
50/x = 100/90
50 times 90 and x times 100 (cross multiply)
4,5000 = 100x
4,500/100 = 100x/100 (Divide both sides by 100)
45 = x
50% of 90 is 45
2. What is 70% of 500?
Answer:
70/x = 100/500
70 times 500 and x times 100 (cross multiply)
35,000 = 100x
35,000/100 = 100x/100 (divide both sides by 100)
350 = x
70% of 500 is 350
3. What is 35% of 250?
Answer:
35/x = 100/250
35 times 250 and x times 100 (cross multiply)
8,750 = 100x
8,750/100 = 100x/100 (divide both sides by 100)
87.5 = x
35% of 250 is 87.5
4. What is 150% of 200?
Answer:
150/x = 100/200
150 times 200 and x times 100 (cross multiply)
30,000 = 100x
30,000/100 = 100x/100 (divide both sides by 100)
300 = x
150% of 200 is 300
5. What is 15% of 45?
Answer:
15/x = 100/45
15 times 45 and x times 100 (cross multiply)
675 = 100x
675/100 = 100x/100 (divide both sides by 100)
6.75 = x
15% of 45 is 6.75
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