Question

write the units digits of the cubes of the following numbers.pls do correct solution also...
1. (387)^3
2. (83)^3
3. (-81)^3
4. (680)^3
5. (864)^3
6. (55)^3

Answer 1

to find unit digit of cube of any number ...then it is necessary to find the cube of unit digit ..
1..in this case ....let's find the cube of it's unit digit which is 7....
so 7^3=49×7=343
whose unit digit is 3

so the answer is 3..

similarly we can find the remaining..

2.7
3.1
4.0
5.4
6.5

I hope this will help u ;)

Answer 2

We could just simply multiply or cube rather the units digit of the number(s) inside the parenthesis. When we manually multiply numbers, we won't any add numbers on the one at the units digit so there won't be any problems.

1. 387^3 = ???
7 * 7 = 49
9 * 7 = 63
3 is the answer

Let's just do the same thing on other items.

2. 83^3
3 * 3 = 9
9 * 3 = 27
7 is the answer 

Other answers:
3. 1
4. 0
5. 4
6. 5