u get a piece of paper and do it
multiply it by itself and then multiply that by the original number. example: 2 cubed. 2*2=4 4*2=8
Using a calculator will make it easier
by one by one
9*4*2 = 72
0
21978
Multiply the digit to the left of the "decimal" point by 2^0 = 1. Multiply the digit to the left of it by 2^1 = 2 Multiply the digit to the left of that by 2^2 = 4 and so on. Also Multiply the digit to the right of the "decimal" point by 2^(-1) = 1/2. Multiply the digit to the right of that by 2^(-2) = 1/4 and so on. Add all these together. Example: Binary 1101.1011 1*2^3 = 1*8 = 8 1*2^2 = 1*4 = 4 0*2^1 = 0*2 =0 1*2^0 = 1*1 = 1 1*2^-1 = 1*1/2 = 0.5 0*2^-2 = 0*1/4 = 0 1*2^-3 = 1*1/8 = 0.125 1*2^-4 = 1*1/16 = 0.0625 Sum = 13.6875
If this is a homework assignment, please consider trying it yourself first, otherwise the value of the reinforcement to the lesson offered by the homework will be lost on you.There are 60 possibilities that can be made for a three digit number using the numbers 2 4 6 8 and 9. (5 choices for the first digit, 4 choices for the second digit, and 3 choices for the third digit - multiply 5, 4, and 3, and you get 60.)To determine how many of these three digit numbers are smaller than 500, consider that, given 2 4 6 8 and 9, the first digit would have to be 2 or 4. That gives 2 choices for the first digit, 4 choices for the second digit, and 3 choices for the third digit. Multiply 2, 4, and 3, and you get 24.
If you multiply 2*9, you get 18. Multiply that by 10 to get a three digit number, and you get 180.
Example: 222*12 222 3 digit * 13 2 digit ------- 666 Multiply 3 to all three twos +222 Multiply 1 to all three twos (skip spot) -------- 2886 Answer Add up
Here are two examples
first digit time second digit and second digit times first digit then repeat