Grade 1 Place Value: Building 2-Digit Numbers
Combine tens and ones to make numbers
What You'll Learn
- Build numbers from tens and ones
- Understand that 2 tens = 20, 3 tens = 30, etc.
- Write the number that a tens value and a ones value make (40 + 7 = 47)
📖Building Numbers
If you have 4 tens and 7 ones, you can build the number 47! The tens digit comes first, then the ones digit.
💡
5 tens = 50, 6 tens = 60, 7 tens = 70. Each ten adds 10 to your number!
Worked examples
Real problems from the practice worksheets, solved one step at a time.
Example 1
What number is 40 + 7?
- To build the number, add the value of each place: 40 + 7.
- 40 + 7 = 47.
Answer: 47
Example 2
What number is 80 + 2?
- To build the number, add the value of each place: 80 + 2.
- 80 + 2 = 82.
Answer: 82
Example 3
What number is 60 + 9?
- To build the number, add the value of each place: 60 + 9.
- 60 + 9 = 69.
Answer: 69
Practice Worksheets
Building 2-Digit Numbers (Set A)
Combine tens and ones to make numbers
10 problemsStart
Building 2-Digit Numbers (Set B)
More practice building numbers
10 problemsStart
Building 2-Digit Numbers (Set C)
Additional number building practice
10 problemsStart
Building 2-Digit Numbers (Set D)
Keep practicing building numbers
10 problemsStart
Building 2-Digit Numbers (Set E)
Master building 2-digit numbers
10 problemsStart