1/4
The reverse operation of dividing by 4 is multiplying by 4. If you have a number that has been divided by 4, you can recover the original number by multiplying the result by 4. For example, if you divide 20 by 4 to get 5, you can reverse it by multiplying 5 by 4 to return to 20.
21978
7
The 4 times table will show that a number is divisible by 4. Therefore, times any number, odd or even, by 4: the answer will be divisible by 4.
23
87912 = 4 x 21978
The reverse operation of dividing by 4 is multiplying by 4. If you have a number that has been divided by 4, you can recover the original number by multiplying the result by 4. For example, if you divide 20 by 4 to get 5, you can reverse it by multiplying 5 by 4 to return to 20.
2178
Reverse the operations. Start with 19, subtract 4, which leaves 15. Divide 15 by 3, and that is the number you began with.
The number is 21978. 21978 when multiplied by 4 which gives the result 87912 which is in reverse order.
21978
00000
44444
Try the reverse. 4 times 5 equals what? What=X. Problem:X/4=5. Multiply both sides by 4. 4X/4=4*5(4/4=1, it goes away). X=20
18 is a solution to the equation 4 plus 7 times a number where the result is 9 times that number.
7
2178 x 4 = 8712