Problem 12 · 2022 Math Kangaroo
Stretch
Geometry & Measurement
areagrid-counting
Below you see five pieces of lawn, each drawn on the same dotted grid. Which one has the smallest area of grass?
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Answer: A
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Hint 1 of 2
Every lawn is drawn on the same dots, so each little square of the grid is the same size.
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Hint 2 of 2
Count how many little grid squares of green each lawn covers, then pick the one that covers the fewest.
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Approach: count the grid squares of green in each lawn
- Because all five lawns sit on the same dotted grid, you can compare them just by counting little squares of green.
- Count the grid squares each green shape covers (count two half-squares as one whole).
- Lawn A covers the fewest green squares, so it has the smallest area; the answer is A.
Mark:
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