Repeated Percentage Change Increase Decrease Worksheet A In

Repeated Percentage Change – Increase & Decrease – Worksheet A In this game, students within groups work to get as close as possible to a target amount. Students could take multiple attempts to find a closest answer. A variety of rules could be used: Students could all use the same / different starting amounts 1 try, 2 tries or 3 tries allowed Switch starting amounts before trying again There are 4 worksheets: compound interest, increase, decrease & mixed The worksheets are in 3 sizes.

Printing To print handouts from slides Select the slide from the left. Then click: File > Print > ‘Print Current Slide’ To print multiple slides Click on a section title to highlight all those slides, or press ‘Ctrl’ at the same time as selecting slides to highlight more than one. Then click: File > Print > ‘Print Selection’ To print double-sided handouts Highlight both slides before using ‘Print Selection’. Choose ‘Print on Both Sides’ and ‘Flip on Short Edge’.

Savings Target! ① How close can you get? 1) Choose your investment amount. 2) Decide! a) A yearly percentage interest. b) The years you will save for (min. 2 years). 3) Calculate the final value of your savings with compound interest. The player closest to the Savings Target gets 1 point for every year they saved (max. 5 points). investment amount savings target A) 220 110 320 350 B) 180 210 245 280 C) 620 330 655 720 D) 825 240 760 860 E) 1700 1450 2050 2400

Bullseye! ② How close can you get? 1) Choose a starting quantity. 2) Decide! a) A percentage increase per time period. b) The amount of time periods (minimum 2). 3) Calculate the final value according to repeated percentage change. The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). starting quantity target amount A) 300 250 350 400 B) 140 70 110 180 C) 540 605 325 645 D) 729 470 275 815 E) 1411 1025 523 1605

Bullseye! ③ How close can you get? 1) Choose a starting quantity. 2) Decide! a) A percentage decrease per time period. b) The amount of time periods (minimum 2). 3) Calculate the final value according to repeated percentage change. The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). starting quantity target amount A) 310 270 450 240 B) 410 480 530 350 C) 435 580 215 145 D) 745 905 1023 722 E) 5680 3505 4220 3200

Bullseye! ④ How close can you get? 1) Choose a starting quantity. 2) Decide! a) A percentage increase or decrease per time period. b) The amount of time periods (minimum 2). 3) Calculate the final value according to repeated percentage change. The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). starting quantity target amount A) 260 460 170 320 B) 340 60 220 140 C) 385 520 775 675 D) 935 695 340 582 E) 1322 2203 4400 2805

Repeated Percentages Duel! Extension Target: 1420 Starting Quantities : 860 & 1020 I’ll start with 860 then! Challenge each other! One person chooses the target, one person chooses the starting quantities. The 1 st player chooses which starting quantity they want. Bonus! Decide how many years the other player has to calculate, or the percentage growth/decay instead!

Savings Target! ① How close can you get? 1) Choose your investment amount. 2) Decide! a) A yearly percentage interest. b) The years you will save for (min. 2 years). 3) Calculate the final value of your savings with compound interest. The player closest to the Savings Target gets 1 point for every year they saved (max. 5 points). 3 years of compound interest… investment amount A) B) C) D) E) 17% 47% 3% 220 110 320 16% 10% 5% 180 210 245 5% 30% 3% 620 330 655 1% 53% 4% 825 240 760 12% 18% 5% 1700 1450 2050 savings target 350 280 720 860 2400

Bullseye! ② How close can you get? 1) Choose a starting quantity. 2) Decide! a) A percentage increase per time period. b) The amount of time periods (minimum 2). 3) Calculate the final value according to repeated percentage change. The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). 2 time periods… starting quantity A) B) C) D) E) 15% 26% 7% 300 250 350 13% 60% 140 70 9% 3% 41% 540 605 325 6% 32% 729 470 275 7% 25% 75% 1411 1025 523 target amount 400 28% 110 180 645 815 1605

Bullseye! ③ How close can you get? 1) Choose a starting quantity. 2) Decide! a) A percentage decrease per time period. b) The amount of time periods (minimum 2). 3) Calculate the final value according to repeated percentage change. The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). 2 time periods… starting quantity A) − 12% − 6% − 27% 310 270 450 − 8% B) 410 target amount 240 − 15% − 19% 480 530 350 − 42% − 50% − 18% C) 435 − 2% D) E) 580 215 145 − 11% − 16% 745 905 1023 − 25% − 4% − 13% 5680 3505 4220 722 3200

Bullseye! ④ How close can you get? 1) Choose a starting quantity. 2) Decide! a) A percentage increase or decrease per time period. b) The amount of time periods (minimum 2). 3) Calculate the final value according to repeated percentage change. The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). 2 time periods… starting quantity 11% − 17% 37% A) B) C) 260 460 − 36% 53% 340 60 E) 220 14% 385 520 775 − 8% 58% 695 340 935 320 − 20% 32% − 21% D) 170 target amount 140 − 7% 46% 13% − 20% 1322 2203 4400 675 582 2805

Savings Target! ① How close can you get? 1) Choose your investment amount. 2) Decide! a) A yearly percentage interest. b) The years you will save for (min. 2 years). 3) Calculate the final value of your savings with compound interest. Savings Target! 1) Choose your investment amount. 2) Decide! a) A yearly percentage interest. b) The years you will save for (min. 2 years). 3) Calculate the final value of your savings with compound interest. The player closest to the Savings Target gets 1 point for every year they saved (max. 5 points). investment amount ① How close can you get? The player closest to the Savings Target gets 1 point for every year they saved (max. 5 points). savings target investment amount savings target A) 220 110 320 350 B) 180 210 245 280 C) 620 330 655 720 D) 825 240 760 860 E) 1700 1450 2050 2400

Bullseye! ② How close can you get? 1) Choose a starting quantity. 2) Decide! a) A percentage increase per time period. b) The amount of time periods (minimum 2). 3) Calculate the final value according to repeated percentage change. The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). starting quantity ② How close can you get? The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). target amount starting quantity target amount A) 300 250 350 400 B) 140 70 110 180 C) 540 605 325 645 D) 729 470 275 815 E) 1411 1025 523 1605

Bullseye! ③ How close can you get? 1) Choose a starting quantity. 2) Decide! a) A percentage decrease per time period. b) The amount of time periods (minimum 2). 3) Calculate the final value according to repeated percentage change. The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). starting quantity ③ How close can you get? The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). target amount starting quantity target amount A) 310 270 450 240 B) 410 480 530 350 C) 435 580 215 145 D) 745 905 1023 722 E) 5680 3505 4220 3200

Bullseye! ④ How close can you get? 1) Choose a starting quantity. 2) Decide! a) A percentage increase or decrease per time period. b) The amount of time periods (minimum 2). 3) Calculate the final value according to repeated percentage change. The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). starting quantity ④ How close can you get? The player closest to the Target Amount gets 1 point for every time period they used (max. 5 points). target amount starting quantity target amount A) 260 460 170 320 B) 340 60 220 140 C) 385 520 775 675 D) 935 695 340 582 E) 1322 2203 4400 2805

Questions? Comments? Suggestions? …or have you found a mistake!? Any feedback would be appreciated . Please feel free to email: tom@goteachmaths. co. uk