Unit rates and the best buy
Answers are for parents and teachers.
1
Find the unit rate: 168 km in 3 hours.
168 ÷ 3 = 56 km/h.
2
12 eggs cost 54 LE. What does one egg cost?
54 ÷ 12 = 4.5 LE.
3
Rice: 2 kg cost 40 LE or 5 kg cost 95 LE. Which is the better buy?
40 ÷ 2 = 20 LE per kg and 95 ÷ 5 = 19 LE per kg. The 5 kg bag is the better buy.
4
A typist types 40 words each minute. How many words in 15 minutes?
40 × 15 = 600 words.
5
Make a ratio table to find the price of 1 litre if 6 litres of milk cost 78 LE.
6 L for 78 LE, 3 L for 39 LE, 1 L for 13 LE. The price is 13 LE per litre.