Math Drills
Expressions Using a Box
A-3Word Problems (Addition and Subtraction)
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What this worksheet covers
- Worksheet
- Expressions Using a Box
In scenes of receiving, giving, using and sharing equally, the unseen figure is set as a box, the relation in the scene is copied straight into an expression, and that box is then found. Both the addition and subtraction shape and the multiplication and division shape appear, and in each the box stands at the very front of the expression. Decimals among the figures are what mark the word problems of this grade.
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Because the answer itself can be reached in the head, the relation using the box never gets written into the expression box and only the arithmetic goes down. Not one box anywhere in the expression means the work of copying the scene into a relation was skipped. Skip it and the multiplication and division shapes, where the figures grow awkward, bring the work to a halt.
In Multiple and Difference/Sum Word Problems the box stacks up two and three deep, and the difference or the total between them becomes the clue. Giving an unseen figure a place to stand is where this unit starts.
- Addition and Subtraction4 questions
Questions & answers
Problems and answers on this worksheet
These are the problems in “Various Word Problems”, shown with their answers.
(1)There was how many m of ribbon. Today you cut off 1.6m, so 1.8m was left. How many m of ribbon was there at first? Let the starting length of ribbon be □ m, write an expression, and find the answer. Expression □-□=□ Answer □
Answer: 1.6, 1.8, 3.4m
(2)There was how many L of milk. Today you bought 0.4L more, so there was 1.7L in total. How many L of milk was there at first? Let the starting amount of milk be □ L, write an expression, and find the answer. Expression □+□=□ Answer □
Answer: 0.4, 1.7, 1.3L
(3)There was how many kg of sugar. You added 0.6kg more, so there was 2.4kg in total. How many kg of sugar was there at first? Let the starting amount of sugar be □ kg, write an expression, and find the answer. Expression □+□=□ Answer □
Answer: 0.6, 2.4, 1.8kg
(4)There was how many L of juice. Today you drank 0.7L, so 1.5L was left. How many L of juice was there at first? Let the starting amount of juice be □ L, write an expression, and find the answer. Expression □-□=□ Answer □
Answer: 0.7, 1.5, 2.2L
What to do next
More worksheets in this unit
Multiple and Difference/Sum Word ProblemsMultiple and Difference/Sum Word Problems Word Problems (Multiples and Difference)
Multiple and Difference/Sum Word ProblemsMultiple and Difference/Sum Word Problems Word Problems (Multiples and Total)
Excess and Shortage ProblemsExcess and Shortage Problems Word Problems
