A trick that is good for multiplying 9's is, remember that each time the tens digit changes the number in the ones spaces minuses 1. If you don't understand what I am saying look at the following:-
9
18
27
36
45
54
63
72
81
See the pattern? In the tens place you need to add 1 and in the tens place you need to subtract by 1.
Hope I helped ya!! xD
You can compare the angles or other measurements to find the one you are looking for.
Step-by-step explanation:
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Answer:
4,370
Step-by-step explanation:
add 10,500, 1,300, and 2,170
then add 3,100 and 6,500
subtract both sums
got it