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1
166+=239
2
220+=313
3
909+=945
4
374+=469
5
255+=341
6
118+=212
7
227+=305
8
824+=920
9
699+=795
10
839+=936
11
965+=1015
12
156+=220
13
492+=517
14
756+=813
15
959+=1048
16
858+=907
17
339+=372
18
459+=546
19
126+=163
20
499+=555
Answer key
What is in this set
The numbers in this set run from 125 to 1,070.
Every problem in it will need a borrow from the column to the left.
A careful solution takes 2 written steps on average.
The mistake this set invites most often, in 100% of the problems: the two numbers on the page were added — a missing part is found by taking one away from the total, not by adding.
Answers are a whole number.
Drawing 240 problems from this page produced 239 different ones, 100% — so a sheet of 20 is a new sheet almost every time.
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.