Finding 40 percent of a number

Follow the Following Steps:

1. Choose a 2-digit number.
2. Multiply the number by 4.
3. Move the decimal point one place to the left.

   Example-1:

1. If the number selected is 21:
2. Multiply by 4: 4 × 21 = 84
3. Move the decimal point one place to the left: 8.4.
4. So 40% of 21 = 8.4.

   Example-2:

1. If the number selected is 73:
2. Multiply by 4: 4 × 73 = 280 + 12 = 292.
3. Move the decimal point one place to the left: 29.2.
4. So 40% of 73 = 29.2.