NBT Quantitative Literacy: Charts, Tables and Graphs Flashcards

A table shows energy costs: electricity R1.50/kWh. If a household uses 400 kWh per month, the monthly electricity bill is:

Answer: R600

Bill = 400 × R1.50 = R600.

A pie chart shows 5 sectors. If the 'other' sector is 18°, what percentage does it represent?

Answer: 5%

Percentage = (18/360) × 100% = 5%.

A graph shows a dam's water level. In January it was 75% full and fell by 10 percentage points each month. In which month did it first drop below 40%?

Answer: May

Jan = 75%, Feb = 65%, Mar = 55%, Apr = 45%, May = 35%; May is the first month the level drops below 40%.

A bar chart shows that 3 out of every 10 learners in a school of 450 take part in drama. How many learners take part in drama?

Answer: 135

3/10 × 450 = 135 learners participate in drama.

A table compares two car insurance plans. Plan A costs R350/month with R2 000 excess; Plan B costs R500/month with R500 excess. After how many months does Plan B's total cost equal Plan A's total cost?

Answer: 10 months

Monthly difference = R150; excess saving with B = R1 500; months = 1 500 ÷ 150 = 10 months.

A line graph shows that a website had 1 200 visitors in Week 1 and 900 visitors in Week 4. Assuming linear decline, how many visitors were there in Week 2?

Answer: 1 100

Total decline over 3 weeks = 300; per week = 100; Week 2 = 1 200 − 100 = 1 100.

A double pie chart compares a household budget in 2020 and 2024. In 2020, food was 35% of spending; in 2024 it is 28%. Total spending rose from R10 000 to R15 000. How much is spent on food in 2024?

Answer: R4 200

Food in 2024 = 28% of R15 000 = 0.28 × 15 000 = R4 200.