Percentage Expressing a Change NonCalculator Worksheet A In

Percentage – Expressing a Change – Non-Calculator – Worksheet A In this activity students in pairs/groups compete to accurately estimate a percentage change before calculating it. There are 3 types of worksheet 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’.

Bullseye! ① How close can you get? 1) Without calculating, estimate the percentage increase needed for the start number to become the target number. 2) Calculate the actual percentage change: how close were you? The player with the closest estimate gets 1 point! Start target A) 20 26 B) 50 85 C) 80 92 D) 60 87 E) 40 74 F) 150 171 G) 160 216 H) 120 192 I) 125 170 J) 300 468

Bullseye! ② How close can you get? 1) Without calculating, estimate the percentage decrease needed for the start number to become the target number. 2) Calculate the actual percentage change: how close were you? The player with the closest estimate gets 1 point! Start target A) 80 64 B) 60 12 C) 50 15 D) 40 34 E) 90 54 F) 120 48 G) 160 88 H) 140 98 I) 150 108 J) 125 20

Bullseye! ③ How close can you get? 1) Without calculating, estimate the percentage change needed for the start number to become the target number. 2) Calculate the actual percentage change: how close were you? The player with the closest estimate gets 1 point! Start target A) 80 104 B) 40 8 C) 120 96 D) 160 216 E) 220 253 F) 90 171 G) 240 84 H) 280 196 I) 75 114 J) 125 30

Bullseye! ① How close can you get? 1) Without calculating, estimate the percentage increase needed for the start number to become the target number. 2) Calculate the actual percentage change: how close were you? The player with the closest estimate gets 1 point! Start target Start +30% A) 20 +70% 26 B) 80 +45% 92 D) +85% E) 40 160 74 F) 125 150 171 +60% 216 H) +36% I) 87 60 +14% +35% G) 85 50 +15% C) target 120 192 +56% 170 J) 300 468

Bullseye! ② How close can you get? 1) Without calculating, estimate the percentage decrease needed for the start number to become the target number. 2) Calculate the actual percentage change: how close were you? The player with the closest estimate gets 1 point! Start target Start − 20% A) 80 − 80% 64 B) − 70% C) 50 90 15 D) 160 54 F) 150 40 34 120 48 − 30% 88 H) − 28% I) 12 − 60% − 45% G) 60 − 15% − 40% E) target 140 98 − 84% 108 J) 125 20

Bullseye! ③ How close can you get? 1) Without calculating, estimate the percentage change needed for the start number to become the target number. 2) Calculate the actual percentage change: how close were you? The player with the closest estimate gets 1 point! Start target Start +30% A) 80 − 80% 104 B) − 20% C) 120 220 96 D) 240 253 F) 75 160 216 90 171 − 30% 84 H) +52% I) 8 +90% − 65% G) 40 +35% +15% E) target 280 196 − 76% 114 J) 125 30

Bullseye! ① How close can you get? 1) Without calculating, estimate the percentage increase needed for the start number to become the target number. 2) Calculate the actual percentage change: how close were you? The player with the closest estimate gets 1 point! Start target A) 20 26 C) 80 E) Start target B) 50 85 A) 20 26 B) 50 85 92 D) 60 87 C) 80 92 D) 60 87 40 74 F) 150 171 E) 40 74 F) 150 171 G) 160 216 H) 120 192 I) 125 170 J) 300 468

Bullseye! ② How close can you get? 1) Without calculating, estimate the percentage decrease needed for the start number to become the target number. 2) Calculate the actual percentage change: how close were you? The player with the closest estimate gets 1 point! Start target A) 80 64 C) 50 E) Start target B) 60 12 A) 80 64 B) 60 12 15 D) 40 34 C) 50 15 D) 40 34 90 54 F) 120 48 E) 90 54 F) 120 48 G) 160 88 H) 140 98 I) 150 108 J) 125 20

Bullseye! ③ How close can you get? 1) Without calculating, estimate the percentage change needed for the start number to become the target number. 2) Calculate the actual percentage change: how close were you? The player with the closest estimate gets 1 point! Start target A) 80 104 C) 120 E) Start target B) 40 8 A) 80 104 B) 40 8 96 D) 160 216 C) 120 96 D) 160 216 220 253 F) 90 171 E) 220 253 F) 90 171 G) 240 84 H) 280 196 I) 75 114 J) 125 30

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