6-digit + 6-digit addition with carrying

Difficulty Standard · Set tc4x69

Fill in what you can and press Check. Nothing you type is sent anywhere.

1
408433+725346
2
244845+890900
3
342810+168072
4
199395+798690
5
977589+559372
6
759125+366367
7
728526+412823
8
311257+902233
9
611177+726593
10
398680+749239
11
681852+323000
12
889454+106269
13
936188+512066
14
628683+320586
15
381259+610880
16
582947+938713
17
261201+186650
18
387855+132876
19
661420+787905
20
172177+661993

What is in this set

The numbers in this set run from 101,298 to 997,992.
Every problem in it will need a carry into the next column.
A careful solution takes 7 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 5 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.