1. Practice before a Percentage Change on finding the amount using a
calculator
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2. Amounts Before Percentage Changes
What number was increased by 10% to give 121?
110
What number was increased by 15% to give 184?
160
What number was increased by 12% to give 252?
225
What number was increased by 27% to give 406.4?
320
What number was decreased by 10% to give 468?
520
What number was decreased by 25% to give 273?
364
What number was decreased by 40% to give 252?
420
What number was decreased by 11% to give 534?
600
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3. Amounts Before Percentage Changes
What number was increased by 12% to give 140?
125
What number was decreased by 12% to give 484?
550
What number was increased by 17.5% to give 282?
240
What number was decreased by 17.5% to give 660?
800
What number was increased by 5.5% to give 147.7?
140
What number was decreased by 5.5% to give 1701?
1800
What number was increased by 1% to give 343.4?
340
What number was decreased by 1% to give 742.5?
750
© T Madas

4. Amounts Before Percentage Changes
110% of a number is 121. What is the number?
110
115% of a number is 184. What is the number?
160
112% of a number is 252. What is the number?
225
127% of a number is What is the number?
320
90% of a number is 468. What is the number?
520
75% of a number is 273. What is the number?
364
60% of a number is 252. What is the number?
420
89% of a number is 534. What is the number?
600
© T Madas

5. Amounts Before Percentage Changes
112% of a number is 140. What is the number?
125
88% of a number is 484. What is the number?
550
117.5% of a number is 282. What is the number?
240
87.5% of a number is 700. What is the number?
800
105.5% of a number is What is the number?
140
94.5% of a number is What is the number?
1800
101% of a number is What is the number?
340
99% of a number is What is the number?
750
© T Madas

6. Test before a Percentage Change on finding the amount using a
calculator
© T Madas

7. Amounts Before Percentage Changes
What number was increased by 10% to give 121?
110
What number was increased by 15% to give 184?
160
What number was increased by 12% to give 252?
225
What number was increased by 27% to give 406.4?
320
What number was decreased by 10% to give 468?
520
What number was decreased by 25% to give 273?
364
What number was decreased by 40% to give 252?
420
What number was decreased by 11% to give 534?
600
© T Madas

8. Amounts Before Percentage Changes
What number was increased by 12% to give 140?
125
What number was decreased by 12% to give 484?
550
What number was increased by 17.5% to give 282?
240
What number was decreased by 17.5% to give 660?
800
What number was increased by 5.5% to give 147.7?
140
What number was decreased by 5.5% to give 1701?
1800
What number was increased by 1% to give 343.4?
340
What number was decreased by 1% to give 742.5?
750
© T Madas

9. Amounts Before Percentage Changes
110% of a number is 121. What is the number?
110
115% of a number is 184. What is the number?
160
112% of a number is 252. What is the number?
225
127% of a number is What is the number?
320
90% of a number is 468. What is the number?
520
75% of a number is 273. What is the number?
364
60% of a number is 252. What is the number?
420
89% of a number is 534. What is the number?
600
© T Madas

10. Amounts Before Percentage Changes
112% of a number is 140. What is the number?
125
88% of a number is 484. What is the number?
550
117.5% of a number is 282. What is the number?
240
87.5% of a number is 700. What is the number?
800
105.5% of a number is What is the number?
140
94.5% of a number is What is the number?
1800
101% of a number is What is the number?
340
99% of a number is What is the number?
750
© T Madas

11. © T Madas