It appears to be 9
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4x = 2x+18
4x-2x =18
2x = 18
x = 18 / 2 = 9
Answer is 9
Checking: 36 (4th multiple of 4) is 18 more than 18 (2nd multiple of 9)
2.3
Divide the 2-digit number by the 1-digit number. If the quotient comes out a whole number, then the big one is a multiple of the small one.
There are a lot of possibilities. The second digit can be 2 through 6, the third digit can be 3 through 7 as long as it is larger than the second digit. What we have so far: 1 _ _ 89
A number is a multiple of 4 if the last 2 digits are a multiple of 4 The 10s digit is even and the last digit is 0, 4 or 8 The 10s digit is odd and the last digit is 2 or 6 A number is a multiple of 8 if the last 3 digits are a multiple of 8 The 100s digit is even and the last 2 digits are a multiple of 8 The 100s digit is odd and the last 2 digits are 4 times an odd number
89+24 change one number to a multiple of ten 90 is closest to 89 and you added by one digit adjust the other number (drop the second number by the same digit as the first number adjusted (one digit). 23 90+23=113 89+24=113