Missing addend with 2-digit numbers

Difficulty Standard · Set 108sce

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1
98+=117
2
83+=147
3
93+=115
4
73+=124
5
73+=105
6
66+=147
7
90+=154
8
84+=102
9
24+=116
10
59+=85
11
79+=176
12
94+=135
13
98+=129
14
92+=160
15
95+=187
16
34+=92
17
88+=143
18
79+=114
19
42+=139
20
62+=115

What is in this set

The numbers in this set run from 10 to 196.
Every problem in it will need a borrow from the column to the left.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: the two numbers on the page were added — a missing part is found by taking one away from the total, not by adding.
Answers are a whole number.

Drawing 240 problems from this page produced 238 different ones, 99% — 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 3 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.