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Solving word problems
Textbook: Part 4, lesson 129, pp. 28–29
GoalSolve simple and compound word problems step by step.
New words
simple problem · sodda masalacompound problem · tarkibli masalacondition · shartquestion · savol
Explanation
A simple problem is solved with one operation; a compound problem needs two or more. First read the story, decide what we know and what we must find, then make a plan. For example: of 76 workers, 29 are men. The women are 76 − 29 = 47. There are 47 − 29 = 18 more women than men.
Worked examples
Of 58 volunteers, 9 work inside. The other 49 split into groups of 7: 49 : 7 = 7 groups.
3 monitors for each of 9 stations: 9 × 3 = 27 monitors.
Class activity
“Problem doctors”: each group gets one compound problem. They split it into two simple problems, write “question 1” and “question 2”, then solve.
Practice
1
76 people work in a hotel, 29 of them are men. How many more women than men are there?
18
2
58 volunteers came to a concert hall. 9 worked inside and the rest were split into groups of 7. How many groups were there?
7
3
3 monitors were put in each of 9 metro stations. How many monitors in all?
27
4
753, 749, 745, 741, … What is the next number?
737