Lesson 8 of 15
Find the value of one
Show on a big screen5 notebooks cost ₹90. What do 8 cost?
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Step 1 of 3
- Five notebooks cost ₹90.
- Divide by 5: one notebook is ₹18.
- Multiply by 8: eight notebooks are ₹144.
The rule
8 notebooks cost ₹144.
When every item is worth the same, divide to find one item. Multiply to find many. This is the unitary method. To check, divide the answer by the items. You get one item's value.
- 9 overs bring 54 runs. One over is 54 ÷ 9 = 6 runs.
- 15 overs, with 6 runs an over, bring 15 × 6 = 90 runs.
- Check: 90 ÷ 15 = 6 again.
Try the lab to finish this lesson.