BrainBoost
Adding a 2-digit number and a 1-digit number (with carrying)
Name:
Date:
Find the sum.
1.
78
+
6
+
5
=
 
2.
65
+
7
=
 
3.
99
+
9
=
 
4.
48
+
8
+
1
=
 
5.
61
+
9
=
 
6.
33
+
8
=
 
7.
68
+
9
=
 
8.
75
+
8
+
9
=
 
9.
40
+
6
=
 
10.
24
+
6
=
 
11.
37
+
9
+
5
=
 
12.
42
+
9
=
 
13.
46
+
8
=
 
14.
36
+
7
=
 
15.
26
+
8
=
 
16.
81
+
8
=
 
17.
22
+
9
=
 
18.
54
+
7
+
7
=
 
19.
87
+
6
=
 
20.
14
+
6
=
 

Adding Two-Digit and One-Digit Numbers Worksheet (Horizontal Format)

This Grade 3 math worksheet focuses on adding a two-digit number with a one-digit number in a horizontal format, including problems that require carrying. This essential skill builds foundation for more complex addition and mental math skills.

Key Learning Points:

  • Understanding horizontal addition
  • Practicing carrying in addition
  • Adding two-digit numbers with one-digit numbers
  • Occasionally adding three numbers for an extra challenge
  • Building mental math skills

The worksheet includes 20 carefully crafted problems that provide practice with:

  • Adding numbers that require carrying (e.g., 21 + 9)
  • Adding numbers without carrying
  • Working with various two-digit numbers
  • Occasional three-number addition problems for extra challenge
  • Building confidence in mental addition skills

Regular practice with these horizontal addition problems helps students master the concept of carrying and prepares them for more advanced mental math techniques.