Math Drills
Order and Strategy
D-3Word Problems
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What this worksheet covers
- Worksheet
- Order and Strategy
What gets chosen here is where to begin, not the arithmetic itself. Spotting a pair that makes ten and gathering it first is practiced in order through addition, through subtraction and through equations that mix the two, and put to work in Word Problems as well.
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Absorbed in hunting for a pair to gather, children lose sight of the fact that the signs in the equation decide whether that pair is added or taken away. Gathering two numbers that were both being subtracted and adding them is the typical slip, and matching the result against the equation as it originally stood shows it up. Forgetting that a term which was being subtracted stays subtracted after the rearrangement also survives.
The four earlier lessons practiced moving through an equation from the front, whereas this one surveys the whole of it before touching anything. 3-Number Calculations closes here and leads into Rules of Calculation in grade four.
- Word Problems6 questions
Questions & answers
Problems and answers on this worksheet
These are the problems in “3-Number Calculations”, shown with their answers.
(1)At the library, Noah had 28 notebooks. He used 6. Then a friend gave him 2 more. How many are there now? Answer □
Answer: 24notebooks
(2)At the kindergarten there were 14 origami sheets. A friend gave 8 more, and big sister gave 2 more too. How many are there altogether? Answer □
Answer: 24origami sheets
(3)In the classroom at school, Noah had 18 pencils. He used 2. Then a friend gave him 2 more. How many are there now? Answer □
Answer: 18pencils
(4)There are 27 apples. 5 were eaten yesterday and 5 today. How many are left? Answer □
Answer: 17apples
(5)In Grace's pencil case there are 10 pencils. Mom gave 3 more, and Dad gave 7 more too. How many are there in all? Answer □
Answer: 20pencils
(6)At craft club, Hannah prepared 13 star decorations. She used 5. Then a friend gave her 7 more. How many are there now? Answer □
Answer: 15star decorations
What to do next
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