Why might you want to use properties to change the order and grouping of the numbers in the following sum? - 45.2+(-7.9) +(-3.8)

-45.2 and - 7.9 are opposite numbers.

- 45.2 and -3.8 are opposite numbers.

-45.2 and -7.9 are compatible numbers.

-45.2 and -3.8 are compatible numbers.

y do u put "subscirbe to ence" on a app for ppl who need with their work?

step-by-step explanation:

1. practice, practice & more practice

2. review errors

3. master the key concepts

do not try to memorise the processes.

4. understand your doubts.

5. create a distraction free study environment

6. create a mathematical dictionary

7. apply maths to real world problems.