Common Core 1.NBT.B.2

Tens and ones

In a two-digit number the left digit tells how many tens. The right digit tells how many ones. The value of a tens digit is that digit times 10.

One worked example

The tens digit in 47

  1. The 4 is in the tens place.
  2. 4 tens means 4 × 10.
  3. The value is 40, not 4.

Answer: 40

Understand that the two digits of a two-digit number are tens and ones.

Easy

Write the value of the digit named in the question.

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1.

Value of the ones digit in 12

2.

Value of the tens digit in 45

3.

Value of the tens digit in 51

4.

Value of the tens digit in 38

5.

Value of the tens digit in 71

6.

Value of the tens digit in 57

Answer key
  1. 2
  2. 40
  3. 50
  4. 30
  5. 70
  6. 50

Medium

Write the value of the digit named in the question.

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1.

Value of the tens digit in 40

2.

Value of the tens digit in 29

3.

Value of the tens digit in 10

4.

Value of the tens digit in 26

5.

Value of the ones digit in 11

6.

Value of the ones digit in 79

7.

Value of the ones digit in 14

8.

Value of the tens digit in 65

9.

Value of the tens digit in 71

Answer key
  1. 40
  2. 20
  3. 10
  4. 20
  5. 1
  6. 9
  7. 4
  8. 60
  9. 70

Hard

Write the value of the digit named in the question.

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1.

Value of the ones digit in 14

2.

Value of the ones digit in 49

3.

Value of the tens digit in 13

4.

Value of the ones digit in 39

5.

Value of the tens digit in 16

6.

Value of the ones digit in 23

7.

Value of the ones digit in 16

8.

Value of the tens digit in 78

9.

Value of the ones digit in 48

10.

Value of the tens digit in 90

11.

Value of the ones digit in 62

12.

Value of the tens digit in 47

Answer key
  1. 4
  2. 9
  3. 10
  4. 9
  5. 10
  6. 3
  7. 6
  8. 70
  9. 8
  10. 90
  11. 2
  12. 40

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