Here are the step-by-step solutions for the problems shown on the worksheet.
1. Whale and Rhinoceros Length Difference
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Step 1: Identify the lengths. The whale is 78 feet long, and the rhinoceros is 13 feet long.
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Step 2: To find the difference, subtract the smaller length from the larger length: $78 - 13$.
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Step 3: Calculate: $78 - 10 = 68$, and $68 - 3 = 65$.
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Result: The difference is 65 feet. This matches option D.
2. Total Length of Two Dogs
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Step 1: Identify the lengths. Bob's dog is 24 inches, and Sue's dog is 15 inches.
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Step 2: To find how long they are together, add the two lengths: $24 + 15$.
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Step 3: Calculate: $20 + 10 = 30$, and $4 + 5 = 9$. So, $30 + 9 = 39$.
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Result: The total length is 39 inches. This matches option C.
3. Total Length of Pencils
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Step 1: Identify the lengths. The pencils are 17 cm, 12 cm, and 9 cm.
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Step 2: Add all three numbers together: $17 + 12 + 9$.
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Step 3: First, add $17 + 12 = 29$. Then, add $29 + 9 = 38$.
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Result: The total length is 38 cm. This matches option C.
4. Haircut Length
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Step 1: Identify the starting and ending lengths. Jenna started with 39 inches and ended with 25 inches.
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Step 2: Subtract the new length from the old length to see what was cut off: $39 - 25$.
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Step 3: Calculate: $39 - 20 = 19$, and $19 - 5 = 14$.
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Result: She cut off 14 inches. This matches option C. (Note: Option B says "14 cm", which is the wrong unit).
5. Mark's Height
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Step 1: Identify Sam's height and the difference. Sam is 57 cm tall. Mark is 13 cm *taller*.
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Step 2: Add the difference to Sam's height: $57 + 13$.
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Step 3: Calculate: $57 + 10 = 67$, and $67 + 3 = 70$.
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Result: Mark is 70 cm tall. This matches option C.
6. Snake Length Difference
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Step 1: Identify the lengths. One snake is 41 cm and the other is 64 cm.
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Step 2: Subtract the smaller number from the larger number: $64 - 41$.
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Step 3: Calculate: $64 - 40 = 24$, and $24 - 1 = 23$.
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Result: The difference is 23 cm. This matches option B.
Final Answer:
1. D
2. C
3. C
4. C
5. C
6. B
Parent Tip: Review the logic above to help your child master the concept of measurement word problems 2nd grade worksheet.
