Find the missing number in twenty ordered subtraction equations, progressing from easy facts to crossing ten.
MathApex√
Missing Number Subtraction within 20
Find the missing number in each subtraction equation.
Name: Date:
Write the missing number on the line.
Question 1:1.−2=2
Question 2:2.9−=3
Question 3:3.−2=6
Question 4:4.8−=7
Question 5:5.−2=4
Question 6:6.2−=1
Question 7:7.−6=12
Question 8:8.14−=13
Question 9:9.−2=15
Question 10:10.14−=12
Question 11:11.−1=14
Question 12:12.15−=13
Question 13:13.−5=8
Question 14:14.20−=6
Question 15:15.−16=4
Question 16:16.20−=15
Question 17:17.−5=6
Question 18:18.20−=19
Question 19:19.−1=17
Question 20:20.17−=4
MathApex
Answer key
Compare the complete equation and missing value with your worksheet.
1.4−2=2→ 4
2.9−6=3→ 6
3.8−2=6→ 8
4.8−1=7→ 1
5.6−2=4→ 6
6.2−1=1→ 1
7.18−6=12→ 18
8.14−1=13→ 1
9.17−2=15→ 17
10.14−2=12→ 2
11.15−1=14→ 15
12.15−2=13→ 2
13.13−5=8→ 13
14.20−14=6→ 14
15.20−16=4→ 20
16.20−5=15→ 5
17.11−5=6→ 11
18.20−1=19→ 1
19.18−1=17→ 18
20.17−13=4→ 13
What is on the worksheet?
The twenty equations begin with familiar subtraction facts and progress to differences within 20. The blank alternates between the minuend and subtrahend while the original operand order remains unchanged.
Keep subtraction in order
Read the known operand and difference carefully before writing the missing value. The optional answer page shows the complete ordered fact and identifies the value that occupied the blank.
Calm and ready to print
No sign-up or email required
High contrast, low-ink A4 layout
The same reviewed maths core used by online practice
We respect your privacy
MathApex uses necessary technologies to run this website. With your permission, we also use Google Analytics to understand how the website is used.
