Problem 3 · 2017 Math Kangaroo
Easy
Geometry & Measurement
grid-countingcareful-counting
How many blocks are missing in this igloo?
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Answer: C — 10
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Hint 1 of 2
Look only at the white hole in the igloo, not the whole dome.
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Hint 2 of 2
Count the empty brick spaces one row at a time and add them up.
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Approach: count the empty brick spaces in the hole
- Look at the white hole in the brick dome.
- Count the missing bricks in each row that the hole passes through.
- Adding the gaps row by row gives 10 empty brick spaces.
- So 10 blocks are missing.
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