Problem Analysis and Solution
The task involves solving multiplication problems and identifying a "trick" problem that is not actually a multiplication problem. Let's solve each problem step by step and identify the trick.
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1) A pack of pens contains 3 pens. How many pens in 2 packs?
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Solution:
Each pack contains 3 pens. For 2 packs, we multiply:
\( 3 \times 2 = 6 \)
Answer: 6 pens
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2) How many wheels on 3 cars?
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Solution:
Each car has 4 wheels. For 3 cars, we multiply:
\( 4 \times 3 = 12 \)
Answer: 12 wheels
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3) A paperclip is made from 10cm of wire. How much wire would I need for 3 paperclips?
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Solution:
Each paperclip requires 10cm of wire. For 3 paperclips, we multiply:
\( 10 \times 3 = 30 \) cm
Answer: 30 cm
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4) Sally runs for 3 miles a day. How far will she run in 3 days?
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Solution:
Sally runs 3 miles per day. In 3 days, we multiply:
\( 3 \times 3 = 9 \) miles
Answer: 9 miles
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5) I buy 5 apples on Monday, and 7 more on Tuesday. How many have I bought in total?
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Solution:
This is an
addition problem, not a multiplication problem. We add the apples bought on Monday and Tuesday:
\( 5 + 7 = 12 \)
Answer: 12 apples
Note: This is the "trick" problem because it is not a multiplication problem.
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6) A multipack bag of crisps holds 6 packets. How many packs of crisps in 2 multipacks?
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Solution:
Each multipack contains 6 packets. For 2 multipacks, we multiply:
\( 6 \times 2 = 12 \) packets
Answer: 12 packets
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7) It takes a rocket 7 seconds to travel a mile. How long would it take the rocket to go 2 miles at that speed?
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Solution:
The rocket takes 7 seconds per mile. For 2 miles, we multiply:
\( 7 \times 2 = 14 \) seconds
Answer: 14 seconds
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Identifying the Trick Problem
The trick problem is
Problem 5, as it involves addition (\( 5 + 7 \)) rather than multiplication.
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Final Answer
\[
\boxed{5}
\]
Parent Tip: Review the logic above to help your child master the concept of word problems for 3rd graders worksheet.
