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In the exercise the number 4 appears, therefore we will write the number 4 twice and get 44.

To calculate an exercise that involves multiplying by 11, simply write twice the number that appears in the exercise.įor example, we will calculate the exercise 4×11. In multiples of 11, we count groups of 11. For example, the sum of the digits of the number 81 is 8+1=9, therefore 81 is a multiple of 9. Multiples of 9 are numbers whose sum of digits is 9.

Therefore, the number 3 is the unity digit in the product. Therefore, the number 6 is the tens digit in the product. The number we get is the unity digit in the product.įor example, we will calculate the exercise 9×7. To calculate the one’s digit, we will subtract from 9 the number we got in the tens digit calculation. We subtract 1 from it, and the number we get is the tens digit in the product. To calculate an exercise involving multiplication by 9, we will look at the number that appears in the exercise. In multiples of 9 we count nines, that is, groups of 9. Multiples of 8 are even numbers, meaning their unity digit belongs to the group: 0, 2, 4, 6, 8. Lift 7 fingers and count backward like this: 8 for the first finger, 6 for the second finger, 4 for the third finger, 2 for the fourth finger, 0 for the fifth finger, 8 for the sixth finger, and 6 for the seventh finger. Therefore, 5 is the tens digit in the product. Since it is greater than 5, we will subtract 2 and get: If we reached 0, we will count again from 8.įor example, we will calculate the exercise 8×7. To calculate the unity digit, raise your fingers according to the number shown in the exercise and count back even numbers from 8 to 0 as the number of raised fingers. The number we get is the tens digit in the product. If it is greater than 5 (between 6 and 10), we subtract 2. If it is less than or equal to 5 (between 1 and 5), we subtract 1. To calculate an exercise involving multiplication by 8, we will look at the number that appears in the exercise.

How do you easily calculate multiples of 8? In multiples of 8 we count eights, that is, groups of 8. Multiples of 6 are even numbers, meaning their unity digit belongs to the group: 0, 2, 4, 6, 8. When there is an exercise that involves multiplying by 6, raise your fingers according to the number that appears in the exercise and say the multiples in order, a multiple for each finger.įor example, to calculate 5×6, lift 5 fingers and count as follows: 6 for the first finger, 12 for the second finger, 18 for the third finger, 24 for the fourth finger, and 30 for the fifth finger. Start from the number 6 and add 6 each time. Method 2: It is possible to remember multiples of 6 in order. Method 1: When you want to calculate an exercise with a number that is multiple of 6, you can calculate the same exercise, but with 5 instead of 6 and add the number that appears in the exercise. How do you easily calculate multiples of 6? In multiples of 6 we count sixes, that is, groups of 6.

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