Simple interest. Game on.

Simple interest is a grade 7 math skill aligned to Common Core standard 7.RP.A.3: use proportional relationships to solve multistep ratio and percent problems. Below are 8 practice questions with answers and step-by-step explanations, drawn from the 30 simple interest problems our math games drill.

CCSS 7.RP.A.330 questions in the bank
Kickoff

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Warm-upeasy

Find the simple interest on $500\text{\char36}500 at 10%10\% per year for 11 year.

I=500×0.10×1=$50I = 500 \times 0.10 \times 1 = \$50.

Mid-gameeasy

Find the simple interest on $400\text{\char36}400 at 25%25\% per year for 11 year.

I=400×0.25×1=$100I = 400 \times 0.25 \times 1 = \$100.

Mid-gameeasy

Find the simple interest on $300\text{\char36}300 at 4%4\% per year for 11 year.

I=300×0.04×1=$12I = 300 \times 0.04 \times 1 = \$12.

Mid-gameeasy

Find the simple interest on $200\text{\char36}200 at 10%10\% per year for 22 years.

I=200×0.10×2=$40I = 200 \times 0.10 \times 2 = \$40.

Mid-gameeasy

Find the simple interest on $100\text{\char36}100 at 5%5\% per year for 11 year.

I=100×0.05×1=$5I = 100 \times 0.05 \times 1 = \$5.

Mid-gameeasy

Find the simple interest on $100\text{\char36}100 at 10%10\% per year for 11 year.

I=100×0.1×1=$10I = 100 \times 0.1 \times 1 = \$10.

Mid-gameeasy

Find the simple interest on $100\text{\char36}100 at 20%20\% per year for 11 year.

I=100×0.2×1=$20I = 100 \times 0.2 \times 1 = \$20.

Buzzer beatereasy

Find the simple interest on $200\text{\char36}200 at 5%5\% per year for 22 years.

I=200×0.05×2=$20I = 200 \times 0.05 \times 2 = \$20.

Overtime

22 more. Played, not assigned.

The rest of the bank lives inside live head-to-head matches — the placement test finds the right starting difficulty.

Drill it inside a game.

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