Grade 3 Addition Missing Number
Grade 3 addition missing number sheet: 24 problems on three-digit addition with regrouping.
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Three different problem sets — same skill, same layout, fresh numbers.
Preview — Set A
Find the number that belongs in each blank.
- 1.490 + 965 = ___
- 2.___ + 213 = 1118
- 3.668 + ___ = 1019
- 4.275 + ___ = 440
- 5.800 + 622 = ___
- 6.360 + ___ = 946
- 7.288 + 692 = ___
- 8.502 + ___ = 1496
- 9.876 + 783 = ___
- 10.___ + 956 = 1787
- 11.878 + 237 = ___
- 12.447 + 448 = ___
- 13.___ + 565 = 1292
- 14.697 + ___ = 1177
- 15.942 + ___ = 1219
- 16.___ + 223 = 604
- 17.256 + ___ = 829
- 18.263 + ___ = 1149
- 19.210 + 920 = ___
- 20.___ + 182 = 1133
- 21.___ + 246 = 1027
- 22.___ + 707 = 1117
- 23.795 + ___ = 1466
- 24.707 + 641 = ___
What this worksheet covers
Set A of this grade 3 missing number sheet holds 24 addition problems on one printable page, with the answer key on the page behind it. Within that, the blank moves between positions from problem to problem, so no single procedure clears the page and the numbers run as high as 1,787. Two problems from the middle of the page — "876 + 783 = ___" and "256 + ___ = 829" — show the range. The sheet sits inside Common Core 3.NBT.2, in the grade 3 Number & Operations in Base Ten strand.
Skills practised
At grade 3, addition is about three-digit column addition with regrouping in more than one place, and this sheet takes one slice of that. The skill on the page: three-digit addition with regrouping. Working the page asks a student to reason backwards from a result to a missing part.
About the missing number format
The 24 problems here move the unknown around, so a student solves for a missing part as often as for a result; problem 9, "876 + 783 = ___" is one of them. A blank on the left or in the middle turns addition into its own inverse and builds the fact-family idea that subtraction rests on.
Set A, Set B and Set C
The three sets come from the same generator with three different seeds: same skill, same layout, fresh numbers, and an answer key computed with the problems. Where Set A's problem 13 is "___ + 565 = 1292", Set B's is "882 + ___ = 1121".
How to use this worksheet
By grade 3 a student should take all 24 addition problems in one sitting. If the page takes more than about fifteen minutes, the underlying facts are probably not automatic yet, and that is worth fixing before more addition practice piles on. Keep the key face down until all 24 problems are finished, then go through the misses together rather than only totalling the score.
One mistake to watch for
Answers to the missing-number problems are the sum of the two visible numbers. On this grade 3 missing number, problem 17 ("256 + ___ = 829") is the kind of item where it shows.
The equals sign is being read as "write the answer here", not as a statement of balance.
Read the equation aloud as a sentence — "something plus five is twelve" — before touching the pencil.
Other grade 3 addition formats
The same skill in the other formats available at this grade.
- Drill — Grade 3 Addition Drill, 30 problems
- Timed Drill — Grade 3 Addition Timed Drill, 72 problems
- Mixed Review — Grade 3 Addition Mixed Review, 30 problems
- Word Problems — Grade 3 Addition Word Problems, 10 problems
- Vertical Format — Grade 3 Three-Digit Addition with Regrouping, 20 problems
A step either side
The same format one grade down and one grade up — the easier sheet is often the faster fix when this one is not landing.
- Grade 2 Addition Missing Number — grade 2, 24 problems
- Grade 4 Addition Missing Number — grade 4, 24 problems
Missing Number sheets in other grade 3 topics
Free to download, print and photocopy for a whole class: three missing number sheets of grade 3 addition, 24 problems each, keys included.