Choose the cheaper snack, work out profit and how many books fit on a shelf, convert metric units, and read fine number lines.
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Compare per gram, multiply for totals, divide for 'how many fit'.
Comparing a 210 g and a 110 g packet by price per gram.
Problem. A 210 g packet of peanut chikki costs ₹70.5. A 110 g packet of potato chips costs ₹33.25. Which is cheaper? (Textbook p. 93, Q1)
Profit and fitting problems.
Shyamala bought 3 kg of bananas at ₹30 per kg and got 35 bananas. She sells each for ₹5. What is her profit? (Textbook p. 93, Q3)
Changing units is multiplying or dividing by 10, 100 or 1000.
1 cm = 10 mm · 1 m = 100 cm · 1 km = 1000 m · 1 kg = 1000 g · 1 g = 1000 mg · 1 l = 1000 ml
Finding the decimals marked on two finely divided number lines.
Problem. Write the decimal number at each arrow. (Textbook p. 93, Q2)
Fill in six unit conversions.
Figure it Out, Textbook p. 94, Q5.
5.5 km = m
35 cm = m
14.5 cm = mm
68 g = kg
9.02 m = mm
125.5 ml = l