Hold out your hand and count your fingers.

For example, suppose you need to calculate 4×9. Find the number 4 first, then bend your fingers and count how many fingers are left and right of the bent fingers. There are three on the left and six on the right.

Finally, put the numbers together and the correct answer is 36.

2. Three-digit multiplication

For example, let's calculate 652×6. First, draw a table as shown, and then fill in the numbers.

Multiply each number by 6 and fill in the form:

6×6 = 36

5×6 = 30

2×6 = 12

Finally, add up the numbers, the first number and the last number remain the same, and you can get the answer.

3. Multiplication of large numbers

For example, calculate 7×53 1, and split the number into multiples of 10, 100 as much as possible.

4. Multiply by 12

Multiplier times 10, then adds it twice, and then adds these numbers together to get the answer.

5. Calculation of15%

If you want to calculate 15% of a number, you need to calculate 10% first. Let's take 400 for example. Move the decimal point one place to the left. Then divide this number by 2 and add 40 to the result. Finally, 05% of 65438+400 equals 60.