Operations and Algebraic Thinking: Identifying Arithmetic Patterns Using Properties (CCSS.3.OA.8)
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3rd Grade Math › Operations and Algebraic Thinking: Identifying Arithmetic Patterns Using Properties (CCSS.3.OA.8)
Maya plans 5 gift bags with 3 stickers in each. She already has 7 stickers at home. How many more stickers must she buy to fill all bags? The store also sells pencils in packs of 12.
22
5
8
3
Explanation
Let $x$ be stickers to buy. Total needed: $5 \times 3 = 15$. Equation: $7 + x = 15$, so $x = 8$. Reasonable since $7 + 8 = 15$. The pencil packs are irrelevant.
During a reading project, the library ordered some books and 10 bookmarks. After giving 3 classes 7 books each, 5 books remained. How many books were ordered in all? The boxes arrived yesterday afternoon.
22
26
36
16
Explanation
Let $b$ be books ordered. Classes use $3 \times 7 = 21$ books. Equation: $b - 21 = 5$, so $b = 26$. Reasonable: $21$ used plus $5$ left makes $26$. The bookmarks and delivery time are irrelevant.
Coach Lee has 28 soccer players and 4 new balls. After 10 students choose band, the rest are split equally into teams of 6. How many full teams are made? Extra jerseys arrive next week.
3
4
18
2
Explanation
Let $t$ be the number of teams. Remaining players: $28 - 10 = 18$. Equation: $18 \div 6 = t$, so $t = 3$. Check: $3 \times 6 = 18$. The balls and jerseys are irrelevant.
For a school art show, Nina prints 36 photos and arranges them on 4 posters equally. She adds 3 extra photos to each poster afterward. How many photos are on each poster now? The stand holds 2 posters.
9
48
15
12
Explanation
Let $p$ be photos per poster now. First: $36 \div 4 = 9$ per poster. Then add $3$: $p = 9 + 3 = 12$. Reasonable since about ten per poster. The stand capacity is irrelevant.