3-digit + 3-digit addition with carrying

Difficulty Standard · Set 1560hr

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1
178+965
2
569+249
3
137+915
4
623+721
5
501+129
6
549+480
7
871+471
8
290+896
9
963+887
10
994+101
11
431+779
12
359+481
13
962+630
14
186+162
15
762+700
16
149+726
17
152+150
18
219+211
19
493+974
20
699+283

What is in this set

The numbers in this set run from 101 to 998.
Every problem in it will need a carry into the next column.
A careful solution takes 4 written steps on average.
The mistake this set invites most often, in 100% of the problems: every column was added on its own and the carry never moved into the next one.
Answers are a whole number.

Drawing 240 problems from this page produced 240 different ones, 100% — 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.