The Transport Museum
Class 4 · Mathematics
4 ideas in Class 4 Mathematics, explained in plain words, with games and quizzes to practise.
Multiplying by 10 and multiples of 10
Multiplying by 10 means counting groups of ten. 6 × 10 is 6 tens, which is 60. For 20, think 2 tens: 12 × 20 is 12 × 2 tens, or 24 tens, which is 240.
Why it matters. Fast, confident multiplication by tens helps with money, measuring and bigger sums, and it shows how place value really works.
Try it in two minutes
- Put out 10 small items such as beans in each of 4 cups and ask how many in all, in tens.
- Ask: how many beans if there were 7 cups? Let your child say it as 7 tens.
- Now use cups of 20 beans and ask for 3 cups. Ask what 2 tens times 3 means.
Try at home. Ask your child to find the cost of 8 items at ₹ 30 each.
Multiplying by 100 and multiples of 100
Multiplying by 100 means counting groups of a hundred. 9 × 100 is 9 hundreds, which is 900. 10 hundreds make 1000, so 12 × 100 is 1200. For 300, think 3 hundreds: 5 × 300 is 15 hundreds, or 1500.
Why it matters. Knowing hundreds well lets children estimate large amounts and avoid mistakes with zeros.
Try it in two minutes
- Use a ₹ 100 note idea: ask how much money 6 notes of ₹ 100 make.
- Ask what happens with 10 notes, and talk about 1000.
- Ask for 4 notes of ₹ 200 and let your child say it as 8 hundreds.
Try at home. Ask your child to find how many pages are in 15 notebooks of 200 pages each.
Splitting numbers to multiply
We can break a hard multiplication into easy pieces. 6 × 12 is 6 × 10 plus 6 × 2, which is 60 plus 12, or 72. If a number is even we can also halve it, multiply and then double.
Why it matters. Splitting makes mental maths easier and shows why written methods work.
Try it in two minutes
- Draw a grid of dots, 5 rows of 14, and ask how many dots.
- Draw a line to split each row into 10 and 4 dots and ask for both parts.
- Add the two parts and then try halving 14 into 7 and 7 and doubling.
Try at home. Ask your child to find 13 × 12 in two different ways.
Division, remainders and dividing by 10 and 100
Division asks how many groups fit. 80 ÷ 10 is 8 because 8 tens make 80. To divide 216 by 18, take away easy groups: 10 groups of 18 is 180, then 2 more groups make 36. What is left over after taking away groups is the remainder.
Why it matters. Division is used in sharing, packing and travel, and the remainder tells us what is left.
Try it in two minutes
- Take 60 beans and ask how many groups of 10. Then try 600 as groups of 100.
- Take 25 beans and make groups of 4. Ask how many groups and what is left.
- Say that the leftover must always be smaller than the group size.
Try at home. Ask your child how many buses of 40 seats are needed for 130 children.
What your child will practise
- Division, remainders and dividing by 10 and 100: Candy Puzzle (Clue Puzzle)
- Division, remainders and dividing by 10 and 100: Candy Quick Fire (Quick Fire)
- Multiplying by 10 and multiples of 10: Number Quest (Match It Up)
- Multiplying by 100 and multiples of 100: Jungle Quest (Flip and Match)
- Splitting numbers to multiply: Jungle Quest (Collect the Answer)
- Quiz: Division, remainders and dividing by 10 and 100 (8 questions)
- Quiz: Multiplying by 10 and multiples of 10 (8 questions)
- Quiz: Multiplying by 100 and multiples of 100 (8 questions)
- Quiz: Splitting numbers to multiply (8 questions)