Problem 2 · 2019 Math Kangaroo
Easy
Arithmetic & Operations
place-value
The diagram shows the number 8. A dot stands for the number 1 and a line for the number 5. Which diagram represents the number 12?
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Answer: C
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Hint 1 of 2
A dot is worth 1 and a line is worth 5; the example 8 uses 3 dots and 1 line.
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Hint 2 of 2
Make 12 using as many 5s (lines) as possible, then add dots for the rest.
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Approach: build 12 from fives and ones
- A line = 5 and a dot = 1.
- Two lines give 10, and two dots give 2, for a total of 12.
- The diagram with 2 lines and 2 dots is C.
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