Supplementary angles

Difficulty Stretch · Set b29n7w

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1
The two angles are supplementary. One is 65°. What is the other, in degrees?
2
The two angles are supplementary. One is 54°. What is the other, in degrees?
3
The two angles are supplementary. One is 18°. What is the other, in degrees?
4
The two angles are supplementary. One is 124°. What is the other, in degrees?
5
The two angles are supplementary. One is 98°. What is the other, in degrees?
6
The two angles are supplementary. One is 40°. What is the other, in degrees?
7
The two angles are supplementary. One is 153°. What is the other, in degrees?
8
The two angles are supplementary. One is 35°. What is the other, in degrees?
9
The two angles are supplementary. One is 121°. What is the other, in degrees?
10
The two angles are supplementary. One is 22°. What is the other, in degrees?
11
The two angles are supplementary. One is 88°. What is the other, in degrees?
12
The two angles are supplementary. One is 158°. What is the other, in degrees?
13
The two angles are supplementary. One is 73°. What is the other, in degrees?
14
The two angles are supplementary. One is 29°. What is the other, in degrees?
15
The two angles are supplementary. One is 61°. What is the other, in degrees?
16
The two angles are supplementary. One is 154°. What is the other, in degrees?
17
The two angles are supplementary. One is 147°. What is the other, in degrees?
18
The two angles are supplementary. One is 65°. What is the other, in degrees?
19
The two angles are supplementary. One is 19°. What is the other, in degrees?
20
The two angles are supplementary. One is 139°. What is the other, in degrees?

What is in this set

The numbers in this set run from 15 to 164.
A careful solution takes 1 written step on average.
The mistake this set invites most often, in 47% of the problems: supplementary angles add to 180°, not 90°.
Answers are a whole number.

Drawing 240 problems from this page produced 116 different ones, 48% — so a sheet of 20 will come back to a problem you have seen — there are only so many sensible ones of this kind.

The same skill, harder or easier

We would put this in front of a grade 5 class. That is our judgement, not a standard, and it is printed here so you can disagree with it. Everything else we put in that year.