Adding a two-digit number to a single-digit number Quiz

Adding a two-digit number to a single-digit number can sometimes be tricky, especially when the sum of the digits in the ones place is 10 or more. This is where “regrouping” comes in handy. Let’s explore how to do this with an example: 47 + 8.

Steps to Add 47 and 8:

1. Add the Ones Place:
   • Look at the digits in the ones place: 7 and 8.
   • Add them together: 7 + 8 = 15.
   • Since 15 is more than 9, write down 5 in the ones place of the answer.
   • Carry over the 1 (which represents 10) to the tens place.
2. Add the Tens Place:
   • Now, add the digit in the tens place of 47, which is 4.
   • Don’t forget to add the 1 you carried over: 4 + 1 = 5.
   • Write down 5 in the tens place of the answer.

So, 47 + 8 = 55.

Why Do We Regroup?

When the sum of the ones place is 10 or more, we regroup because 10 ones equal 1 ten. This helps us keep our numbers organized and ensures our addition is accurate.

Practice Makes Perfect!

The more you practice, the better you’ll get at adding with regrouping. Try adding these pairs of numbers:

Remember to add the ones place first, carry over if needed, and then add the tens place. Happy adding!

Quiz:

1) Add these numbers:

2) Add these numbers:

3) Add these numbers:

4) Add these numbers:

5) Add these numbers:

6) Add these numbers:

7) Add these numbers:

8) Add these numbers:

9) Add these numbers:

10) Add these numbers:

Answers:
1) 47
2) 50
3) 42
4) 34
5) 73
6) 82
7) 95
8) 40
9) 38
10) 43