Last reviewed: 25 October 2026
Grade 6 is the year many families take maths revision seriously, because the KPSEA Mathematics paper closes primary school. This guide focuses on what actually trips learners up. When we looked at the topics missed on the Grade 6 maths CBC Challenge, fractions and percentages came out on top, followed by area, capacity and decimals. Most children who use the Challenge already score well overall, so the marks they lose sit in a few predictable places. Fix those and the whole paper feels easier.
On this page
1. Fractions: the topic missed most
Most fraction errors are not about hard ideas. They come from rushing the method. Three rules cover most questions:
- Adding and subtracting: make the denominators the same first. 1/3 + 1/4 becomes 4/12 + 3/12 = 7/12. Never add the bottom numbers.
- Multiplying: multiply tops and bottoms, then simplify. 2/3 × 3/5 = 6/15 = 2/5.
- Dividing: keep the first fraction, flip the second and multiply. 3/4 ÷ 1/2 = 3/4 × 2/1 = 6/4 = 1 1/2.
Word problems such as “Akinyi spent 2/5 of KES 500” simply mean 2/5 × 500 = KES 200. Encourage your child to write “of means multiply” at the top of their rough work. The Maths Is Fun fractions pages have clear pictures for children who need to see why the rules work. Our Grade 6 fractions revision has more practice.
2. Percentages
A percentage is a fraction out of 100. Teach one reliable method: find 1%, then scale. To find 15% of KES 2,400, 1% is 24, so 15% is 24 × 15 = KES 360. For a discount, work out the percentage and subtract it from the price. To write a fraction as a percentage, multiply by 100: 3/4 × 100 = 75%. Learners often forget to subtract in “after a 10% discount” questions, so ask them to underline the word after. The percentage explainer on Maths Is Fun is a good second explanation, and our decimals and percentages revision page links the two topics.
3. Area
Area is the space inside a shape, measured in square units. Rectangle: length × width. Triangle: half × base × height. The usual mistakes are mixing up area and perimeter, and forgetting the “square” in cm². A quick check helps. If the answer is a distance around the edge, it is perimeter, in cm. If it is the space to cover, like tiles on a floor, it is area, in cm². See the area and perimeter revision for practice.
4. Capacity and conversions
Capacity questions are mostly about converting units: 1 litre = 1,000 millilitres. A 500 ml bottle is half a litre, and 2.5 litres is 2,500 ml. Errors come from moving the decimal point the wrong way. Teach the rule: going to a smaller unit makes the number bigger. Practise with real containers at home, such as a 1-litre milk packet, a 300 ml soda and a 20-litre jerrican.
5. Decimals and time
For decimals, line up the decimal points before adding or subtracting: 4.5 + 0.75 is 4.50 + 0.75 = 5.25. For time, remember there are 60 minutes in an hour, not 100. So 1 hour 45 minutes plus 30 minutes is 2 hours 15 minutes, not 1 hour 75 minutes. Converting between the 12-hour and 24-hour clock also comes up. 3.30 pm is 1530 hours.
A 20-minute daily plan
- 5 minutes: one quick set on the Grade 6 CBC Challenge. It marks each answer instantly with the working.
- 10 minutes: revise the first topic in the “Revise next” list on the results screen.
- 5 minutes: your child explains one corrected question to you, out loud. Explaining a method shows whether it has really been understood.
Once a week, sit a full timed paper from our Grade 6 revision papers to build stamina. The KPSEA Mathematics paper has 30 multiple-choice questions in 1 hour 20 minutes, as printed on past KNEC KPSEA Mathematics papers.
Keep it calm
Short, regular practice beats long cramming sessions. Praise effort and corrections, not just scores. A child who gets 6/10 and then understands the four mistakes has learnt more than one who gets 9/10 by luck. For exam-week advice, read our guide to preparing for KPSEA maths.