4-digit + 4-digit addition with carrying

Difficulty Stretch · Set xvbxmt

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1
8668+4936
2
7262+7989
3
7047+8979
4
8355+2847
5
9775+8655
6
8429+8685
7
6967+3959
8
3243+9978
9
5814+5799
10
5262+4779
11
5784+7429
12
9779+1273
13
8207+3994
14
6894+7157
15
8988+5849
16
2999+7797
17
6364+5688
18
6178+3954
19
3956+8296
20
6697+8356

What is in this set

The numbers in this set run from 1,035 to 9,998.
Every problem in it will need a carry into the next column.
A careful solution takes 5 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 4 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.