Let’s solve each problem step by step.
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Problem 1:
The chicken pen held 7 chickens. Each chicken lays 6 eggs a day. How many eggs would they get altogether after 30 days?
Step 1: Find how many eggs all chickens lay in one day.
7 chickens × 6 eggs = 42 eggs per day.
Step 2: Multiply by number of days (30).
42 eggs/day × 30 days = 1,260 eggs.
✔ Check: 7 × 6 = 42; 42 × 30 = 1,260. Correct.
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Problem 2:
Simone cut 4 pieces of wood: 4.2m, 3.5m, 3.7m, and 9.2m. She put them together to form one long piece. How long was it?
Step 1: Add all the lengths.
4.2 + 3.5 = 7.7
7.7 + 3.7 = 11.4
11.4 + 9.2 = 20.6
✔ Total length = 20.6 meters.
Check: 4.2 + 3.5 + 3.7 + 9.2 = let’s add decimals first:
(4.2 + 9.2) = 13.4
(3.5 + 3.7) = 7.2
13.4 + 7.2 = 20.6 → Correct.
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Problem 3:
Patrick ordered 9 pizzas. Each pizza has 8 slices. There were 12 people at the party. How many slices did they each get?
Step 1: Find total slices.
9 pizzas × 8 slices = 72 slices.
Step 2: Divide equally among 12 people.
72 ÷ 12 = 6 slices per person.
✔ Check: 12 × 6 = 72 → Correct.
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Problem 4:
A car company made 12 cars a week for 4 weeks. Then they doubled this amount over the next 4 weeks. How many cars did they make after 8 weeks?
Step 1: First 4 weeks:
12 cars/week × 4 weeks = 48 cars.
Step 2: Next 4 weeks — they “doubled this amount”.
What does “this amount” mean? It means double the weekly rate:
12 × 2 = 24 cars per week.
So, 24 cars/week × 4 weeks = 96 cars.
Step 3: Total over 8 weeks:
48 + 96 = 144 cars.
✔ Check:
First 4 weeks: 12×4=48
Next 4 weeks: 24×4=96
Total: 48+96=144 → Correct.
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Final Answer:
1. 1,260
2. 20.6m
3. 6
4. 144
Parent Tip: Review the logic above to help your child master the concept of addition problem solving worksheet 4th grade.
