Remarkable / Worksheets / Grade 7 Maths / Ratio and rate
A one-page CAPS Grade 7 Maths poster on ratio and rate (Calculations), with the key ideas, key words and a tip to remember.
A ratio compares quantities of the same kind. The order matters.
7 apples and 4 pears:
apples : pears = 7 : 4
pears : apples = 4 : 7
Multiply or divide both numbers by the same number. Use the same units first.
30 : 45 = 10 : 15 = 2 : 3
50 cm : 2 m = 50 cm : 200 cm = 1 : 4
Share R300 in the ratio 1 : 4.
1 + 4 = 5 parts
300 ÷ 5 = R60 for each part
R60 and 4 × 60 = R240
A rate compares different kinds of quantities, with units: km/h, R/kg.
180 km in 2 hours
180 ÷ 2 = 90 km/h
Find the cost of one unit, then work out the amount you need.
3 kg cost R45, so 1 kg costs R15.
1 kg for R24 or 3 kg for R66?
66 ÷ 3 = R22 per kg, so 3 kg is the better buy.
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