Mental Multiplication Test
mediumMultiplying in your head is much easier with a few tricks. This test asks ten questions per round: Easy multiplies a 2-digit number by a single digit, Medium uses 3-digit by 1-digit and 2-digit by 11, 12, 15 or 25, and Hard multiplies two 2-digit numbers.
3-digit × 1-digit, and 2-digit × 11, 12, 15 or 25.
Below you will find the products worth memorising and one-line shortcuts for multiplying by 5, 9, 11 and 25.
Products worth memorising
| Multiplication | Answer |
|---|---|
| 6 × 7 | 42 |
| 6 × 8 | 48 |
| 7 × 8 | 56 |
| 7 × 9 | 63 |
| 8 × 9 | 72 |
| 12 × 12 | 144 |
| 13 × 13 | 169 |
| 14 × 14 | 196 |
| 15 × 15 | 225 |
| 16 × 16 | 256 |
| 17 × 17 | 289 |
| 18 × 18 | 324 |
| 19 × 19 | 361 |
| 25 × 25 | 625 |
Tricks for faster mental multiplication
- Split and add: 47 × 6 = 40 × 6 + 7 × 6 = 240 + 42 = 282.
- Times 11: add the digits and put the total in the middle. 47 × 11 → 4, (4+7=11), 7 → carry the 1 → 517.
- Times 5: halve the number and multiply by 10. 48 × 5 = 24 × 10 = 240.
- Times 9 or 99: use 10 (or 100) times the number, minus the number. 36 × 9 = 360 − 36 = 324, and 99 × 7 = 700 − 7 = 693.
- Times 25: divide by 4, then multiply by 100. 36 × 25 = 9 × 100 = 900.
- Double and halve: 35 × 16 = 70 × 8 = 140 × 4 = 280 × 2 = 560.
Frequently asked questions
What is 36 × 25?
36 × 25 = 900. Times 25: divide by 4, then multiply by 100. 36 × 25 = 9 × 100 = 900.
What is 47 × 11?
47 × 11 = 517. Times 11: add the digits and put the total in the middle. 47 × 11 → 4, (4+7=11), 7 → carry the 1 → 517.
What is 99 × 7?
99 × 7 = 693, because 100 × 7 = 700 and 700 − 7 = 693.
How do you multiply two-digit numbers in your head?
Split and add: 47 × 6 = 40 × 6 + 7 × 6 = 240 + 42 = 282. Double and halve: 35 × 16 = 70 × 8 = 140 × 4 = 280 × 2 = 560.
How is the speed maths test scored?
Each test has 10 questions. Answer 8 or more correctly to pass. Your time is recorded for the whole test, and your best time for each test and level is saved on your own device, so you can try to beat it.