How long is the blue pencil in centimeters?
The blue pencil is 21 centimeters.
How long is the yellow pencil in centimeters?
The yellow pencil is 13 centimeters.
What equation can you use to find the total length of both pencils?
Find the sum. How did you find it?
The sum is 34; explanations vary.
What equation can you use to find out how much longer the blue pencil is than the yellow pencil?
Find the difference. How did you find it?
The difference is 8; explanations vary.
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