3-digit + 3-digit addition with carrying

Difficulty Stretch · Set pbgv97

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1
661+369
2
851+599
3
878+434
4
454+587
5
996+159
6
659+394
7
888+936
8
886+554
9
858+699
10
719+688
11
971+959
12
943+188
13
426+587
14
365+847
15
871+249
16
278+869
17
848+379
18
343+679
19
576+665
20
897+504

What is in this set

The numbers in this set run from 124 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.