Math Drills
Expressions Using a Box
A-2Word Problems (Setting Up Addition and Subtraction)
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What this worksheet covers
- Topic
- Rules of Calculation
- Worksheet
- Expressions Using a Box
A scene is copied into an expression with the unknown figure left written as a box. Expressions Using a Box (Writing Addition and Subtraction) and Expressions Using a Box (Writing Multiplication and Division) bring the box on the left as often as on the right. Expressions Using a Box (Word Problems) works back from the total cost of some goods to the price of one.
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Where the box sits changes the direction of working back. In a shape with the box on the side being subtracted from, the box is the largest figure of all, so the answer exceeds the figure to the right of the equals sign. Subtract there and a figure smaller than that one goes into the box. Holding a finger on the box before the pencil moves cuts down on taking the direction wrongly.
The next unit, Perpendicular and Parallel Lines, Quadrilaterals, deals with figures, yet this same stance reappears wherever an unknown length has to be found from how sides and angles stand. The rules about expressions running on from Commutative, Associative, and Distributive Laws have come round here to the expressions the child writes.
- Expressions Using a Box (Writing Addition and Subtraction)5 questions
Questions & answers
Problems and answers on this worksheet
These are the problems in “Rules of Calculation”, shown with their answers.
(1)You have □ acorns. After picking up 24 more, you have 50 in all. Find the number that fits in □. □+24=50 Answer □
Answer: 26
(2)There were 42 loaves of bread. After selling □, 27 remained. Find the number that fits in □. 42-□=27 Answer □
Answer: 15
(3)There were □ oranges. After eating 9, 16 remained. Find the number that fits in □. □-9=16 Answer □
Answer: 25
(4)There were 30 apples. After eating □, 18 remained. Find the number that fits in □. 30-□=18 Answer □
Answer: 12
(5)There were □ stickers. After getting 15 more, there were 42 in all. Find the number that fits in □. □+15=42 Answer □
Answer: 27
What to do next
More worksheets in this unit
Order of Operations with Whole NumbersOrder of Operations with Whole Numbers Calculation (With Parentheses)
Commutative, Associative, and Distributive LawsCommutative, Associative, and Distributive Laws Fill in the Blank
Commutative, Associative, and Distributive LawsCommutative, Associative, and Distributive Laws Calculation
Commutative, Associative, and Distributive LawsCommutative, Associative, and Distributive Laws Word Problems
Expressions Using a BoxExpressions Using a Box Word Problems (Setting Up Multiplication and Division)
Expressions Using a BoxExpressions Using a Box Word Problems (Application)
