Double-Digit Addition with Missing Addends (No Regrouping) – quiz

Adding double-digit numbers is a fun skill, and sometimes you’ll come across problems where a number is missing. These are called missing addend problems! In this post, we’ll learn how to solve these puzzles when there is no regrouping needed. 🧠✨

✨ What is a Missing Addend?

In an addition problem, a missing addend is the number you need to figure out to complete the equation. For example:

25 + ___ = 42

Here, we need to find the number that, when added to 25, equals 42.

🧠 How Do We Solve Missing Addend Problems?

To solve a missing addend problem:

  1. Start with the total (the number after the equals sign).
  2. Subtract the number you know from the total to find the missing number.

Example:

37 + ___ = 55

Step-by-Step Solution:

  1. Start with the total: 55.
  2. Subtract the known number (37) from 55:

55−37=18

✅ The missing addend is 18.
So, 37 + 18 = 55.

🔍 No Regrouping Means Easy Subtraction!

In these problems, the subtraction is straightforward because the digits don’t require borrowing. The numbers are designed so that each place value can be subtracted without carrying.

Example 2:

42 + ___ = 67

Step-by-Step Solution:

  1. Start with the total: 67.
  2. Subtract the known number (42) from 67:

67−42=25

✅ The missing addend is 25.
So, 42 + 25 = 67.

Quiz:

1) Find the missing number:

1 2
+ 3
4 6

2) Find the missing number:

1 0
+ 1
2 4

3) Find the missing number:

3 1
+ 3
6 3

4) Find the missing number:

5 2
+ 2
7 3

5) Find the missing number:

5 1
+ 3
8 5

6) Find the missing number:

5 3
+ 2
7 4

7) Find the missing number:

5 3
+ 2
7 6

8) Find the missing number:

4 4
+ 4
8 7

9) Find the missing number:

3 0
+ 2
5 2

10) Find the missing number:

2 2
+ 2
4 6

Answers:
1) 4
2) 4
3) 2
4) 1
5) 4
6) 1
7) 3
8) 3
9) 2
10) 4