3-digit + 3-digit addition, no carrying

Difficulty Standard · Set y0oqq7

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1
507+140
2
160+806
3
636+141
4
678+110
5
159+240
6
645+230
7
824+153
8
239+400
9
645+103
10
823+131
11
422+452
12
657+232
13
706+241
14
631+128
15
509+250
16
549+340
17
106+863
18
343+211
19
573+305
20
475+122

What is in this set

The numbers in this set run from 100 to 894.
Every problem in it will come out column by column with nothing carried.
A careful solution takes 3 written steps on average.
The mistake this set invites most often, in 100% of the problems: the two numbers were subtracted instead of added.
Answers are a whole number.

Drawing 240 problems from this page produced 237 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.