Find the missing number in twenty addition equations, moving from easy facts to sums that cross ten.
MathApex√
Missing Number Addition within 20
Find the missing number in each addition equation.
Name: Date:
Write the missing number on the line.
Question 1:1.+5=6
Question 2:2.1+=4
Question 3:3.+4=7
Question 4:4.4+=8
Question 5:5.+4=5
Question 6:6.4+=9
Question 7:7.+10=12
Question 8:8.3+=16
Question 9:9.+10=20
Question 10:10.1+=18
Question 11:11.+13=17
Question 12:12.1+=14
Question 13:13.+19=20
Question 14:14.7+=20
Question 15:15.+6=10
Question 16:16.3+=10
Question 17:17.+7=13
Question 18:18.7+=15
Question 19:19.+9=17
Question 20:20.2+=19
MathApex
Answer key
Compare the complete equation and missing value with your worksheet.
1.1+5=6→ 1
2.1+3=4→ 3
3.3+4=7→ 3
4.4+4=8→ 4
5.1+4=5→ 1
6.4+5=9→ 5
7.2+10=12→ 2
8.3+13=16→ 13
9.10+10=20→ 10
10.1+17=18→ 17
11.4+13=17→ 4
12.1+13=14→ 13
13.1+19=20→ 1
14.7+13=20→ 13
15.4+6=10→ 4
16.3+7=10→ 7
17.6+7=13→ 6
18.7+8=15→ 8
19.8+9=17→ 8
20.2+17=19→ 17
What is on the worksheet?
The twenty equations begin with familiar facts, continue with sums within 20 that do not cross ten, and then practise making ten. The blank alternates between the first and second addend.
Read the whole equation
Use the known addend and total to decide what belongs on the writing line. The optional answer page shows each complete equation and identifies the missing value.
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.
