Number Puzzles

Missing Digit Addition

Work backwards! The answer is given — fill in the missing digits to complete the sum. Multiple solutions may be correct!

Missing Digit Addition
Settings
Steps
Level
Options
Questions
Summary
Choose Your Level
Select a difficulty level to begin.
1
Level 1

2–3 digit numbers

2 addends

1–2 missing digits

2
Level 2

3–4 digit numbers

2–3 addends

2–3 missing digits

3
Level 3

4–5 digit numbers

2–4 addends

3–5 missing digits

Step 1 of 4
Level Options
Configure your game options.
Step 2 of 4
Number of Questions
How many puzzles would you like to solve?
5
10
15
20
Step 3 of 4
Ready to play?
Check your settings before starting.
Level —
Questions —
Step 4 of 4
Score
0/0
Question
1/10
Accuracy
0%
Fill in the missing digits to make the sum correct
🏆
Game complete!
Great work!
0%
Accuracy
0
Correct
0
Answered
Question review
How to play
1
Look at the answer
The total is shown at the bottom of the column. Some digits in the addends are missing — shown as empty boxes.
2
Fill in the missing digits
Type digits (0–9) into the boxes. The numbers you fill in must add up to the given answer. Multiple solutions may be correct!
3
Check your answer
Press Check Answer. If your digits make the sum correct, it's right — even if different from the original numbers!
4_ + 3_ = 80
e.g. 47 + 33 = 80, or 42 + 38 = 80 — both correct!