Multiplying · Year 7
In Year 7 you learn: multiplying large numbers in problems.
Multiplying puts equal groups together. Once numbers get bigger than the times tables, we split them into parts and multiply each part: the grid method, short multiplication and long multiplication.
Key facts
- Long multiplication: multiply by the ones digit, then by the tens (put a 0 first), then add the rows.
- Estimate first by rounding each number; if your answer is far from the estimate, check your working.
Worked examples
Example 1
46 × 23
Answer: 1,058
Example 2
Work out 326 × 47.
Answer: 15,322
Example 3
A theatre has 46 rows with 28 seats in each row. Every seat is sold for 15 shows. How many tickets is that?
Answer: 19,320 tickets
Example 4
Estimate, then work out 4,906 × 38.
Answer: 186,428