Mass and Weight Problems for 11+ Maths: Calm Guidance for Parents
19 October 2026
Understanding mass and weight
Many 11+ Maths questions ask children to solve problems involving mass and weight. It's useful to know that mass measures how much matter is in an object (in grams or kilograms), while weight is the force of gravity on that mass. For 11+ purposes, these terms are often used interchangeably, but metric units like grams (g) and kilograms (kg) are most common.
Reading scales and estimating
Children should be confident reading both digital and analogue scales. This includes kitchen scales, bathroom scales, and measuring jugs marked in grams or kilograms. Practise estimating the weight of everyday objects, then checking on the scales. This helps build a sense of reasonable answers in word problems.
Solving mass and weight word problems
Typical 11+ questions might ask: "A bag of apples weighs 1.2 kg. A box contains 8 bags. What is the total weight?" Encourage your child to underline key information, identify what's being asked, and decide which operation (addition, subtraction, multiplication, or division) is needed. Drawing bar models or jotting short notes can help organise thinking.
Unit conversions in context
11+ problems often require converting between grams and kilograms. Remind your child that 1 kilogram equals 1,000 grams. For example, to change 2.5 kg into grams, multiply by 1,000 (2,500 g). If a problem mixes units, convert everything to the same unit before calculating.
Key insight: Focus on method, not just the answer
Encourage your child to explain their steps out loud. This clarifies their thinking and helps spot errors early. If they make a mistake, calmly work through the problem together and discuss where things went off track. Confidence grows through practice and reflection.
