Midpoint of two points

Difficulty Standard · Set lgowyp

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1
What is the midpoint of (3, 3) and (21, 27)? Give it as x, y.
2
What is the midpoint of (2, -2) and (12, 22)? Give it as x, y.
3
What is the midpoint of (2, 2) and (8, 10)? Give it as x, y.
4
What is the midpoint of (1, -4) and (7, 4)? Give it as x, y.
5
What is the midpoint of (-2, 0) and (16, 24)? Give it as x, y.
6
What is the midpoint of (1, 1) and (7, 9)? Give it as x, y.
7
What is the midpoint of (-1, -4) and (5, 4)? Give it as x, y.
8
What is the midpoint of (-1, 2) and (11, 18)? Give it as x, y.
9
What is the midpoint of (-4, -6) and (2, 2)? Give it as x, y.
10
What is the midpoint of (4, -5) and (16, 11)? Give it as x, y.
11
What is the midpoint of (0, -6) and (18, 18)? Give it as x, y.
12
What is the midpoint of (-1, -6) and (9, 18)? Give it as x, y.
13
What is the midpoint of (-3, 1) and (7, 25)? Give it as x, y.
14
What is the midpoint of (-6, 0) and (0, 8)? Give it as x, y.
15
What is the midpoint of (-2, 0) and (10, 16)? Give it as x, y.
16
What is the midpoint of (-5, -5) and (7, 11)? Give it as x, y.
17
What is the midpoint of (-3, 4) and (9, 20)? Give it as x, y.
18
What is the midpoint of (4, 1) and (22, 25)? Give it as x, y.
19
What is the midpoint of (1, 3) and (19, 27)? Give it as x, y.
20
What is the midpoint of (-6, -2) and (0, 6)? Give it as x, y.

What is in this set

The numbers in this set run from 1 to 28.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: the differences were written down; the midpoint is the average of each coordinate.
Answers are a short answer exactly as the problem asks for it.

Drawing 240 problems from this page produced 188 different ones, 78% — so a sheet of 20 is a new sheet almost every time.

The same skill, harder or easier

We would put this in front of a grade 8 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.