Introduction to Counting in Tens

Hello, Year 4! Today, we’re going to learn about a very useful way to count: counting in tens. This method can help us add and subtract numbers quickly. It’s like grouping things in sets of ten. Let’s dive in!

What Does Counting in Tens Mean?

When we count in tens, we start at a number and keep adding ten each time. For example:

  • Start at 0:
    • The next number is 10 (0 + 10)
    • Then, we add another ten to get 20 (10 + 10)
    • Then, 30 (20 + 10)

So, if we count in tens from 0, we get:

0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.

Key Rules of Counting in Tens

  1. Skip Counting: When you count in tens, you skip over all the numbers in between. For example, from 10 to 20, you skip 11, 12, 13, 14, 15, 16, 17, 18, 19.
  2. Adding Tens: If you have a number and you want to add ten, just increase the tens place by one. For example, if you start with 34 and add 10, you get 44 (34 + 10).
  3. Subtracting Tens: If you have a number and you want to take away ten, just decrease the tens place by one. For example, from 82, if you take away 10, you get 72 (82 – 10).

Tips and Tricks for Counting in Tens

  • Use Your Fingers: Try using your fingers to count by tens. For every ten, hold up a finger until you reach a number.
  • Visual Aids: Draw ten dots in a row to see how counting in tens works. Group them together so it’s easier to count.
  • Practice with Objects: Use things around you like pencils, blocks, or coins. Group them in sets of ten to count them.

Questions for Practice

Easy Level Questions (0-10)

  1. What is 0 + 10?
  2. Count in tens from 10 to 50.
  3. What is 30 + 10?
  4. Write the next number: 20, ___.
  5. What is 50 – 10?
  6. Count backwards in tens from 30.
  7. What number comes after 70?
  8. If you start at 10, what is 10 more?
  9. What is 40 – 10?
  10. Write the next number: 90, ___.

Medium Level Questions (10-30)

  1. What is 10 + 10 + 10?
  2. Count in tens from 20 to 100.
  3. What is 60 + 10?
  4. Write the next number: 40, ___.
  5. What is 80 – 20?
  6. If you have 30 and add 30, what do you get?
  7. Count backwards in tens from 70.
  8. What is 50 + 30?
  9. Write the next number: 10, 20, 30, ___.
  10. What is 90 – 20?

Hard Level Questions (30-50)

  1. If you start at 40 and keep adding 10, what do you get after three steps?
  2. Count in tens from 10 to 200.
  3. What is 100 – 30?
  4. What number comes after 80, if you count by tens?
  5. If you have 90 and you take away 40, what do you get?
  6. Write the next number: 30, 40, 50, ___.
  7. What is 70 + 10 + 10?
  8. If you have 60 and you add 40, what is the total?
  9. Count backwards in tens from 100 to 0.
  10. If you start at 20, what do you get after adding 70?

Answers

Easy Level Answers

  1. 10
  2. 10, 20, 30, 40, 50
  3. 40
  4. 30
  5. 40
  6. 30, 20, 10, 0
  7. 80
  8. 20
  9. 30
  10. 100

Medium Level Answers

  1. 30
  2. 20, 30, 40, 50, 60, 70, 80, 90, 100
  3. 70
  4. 50
  5. 60
  6. 60
  7. 60, 50, 40, 30
  8. 80
  9. 40
  10. 70

Hard Level Answers

  1. 70, 80, 90
  2. 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200
  3. 70
  4. 90
  5. 50
  6. 60
  7. 90
  8. 100
  9. 90, 80, 70, 60, 50, 40, 30, 20, 10, 0
  10. 90

By practicing counting in tens, you will become a pro at adding and subtracting quickly! Keep up the great work, Year 4!