Introduction to Counting in Large Numbers

Hello Year 5! Today, we’re going to learn about counting in large numbers: specifically in tens of thousands (10,000s), hundreds of thousands (100,000s), and millions (1,000,000s). This will help you understand big numbers better and make counting easier.

What Does It Mean to Count in 10,000s, 100,000s, and 1,000,000s?

When we count in these big jumps, we skip a lot of numbers. Instead of counting 1, 2, 3, and so on, we jump to larger numbers.

  • Counting in 10,000s means we add 10,000 each time. For example:
    • 10,000
    • 20,000
    • 30,000
    • 40,000
  • Counting in 100,000s means we add 100,000 each time. For example:
    • 100,000
    • 200,000
    • 300,000
    • 400,000
  • Counting in 1,000,000s means we add 1,000,000 each time. For example:
    • 1,000,000
    • 2,000,000
    • 3,000,000
    • 4,000,000

Key Rules for Counting in Large Numbers

  1. Always start from zero or from the last number you counted.
  2. Add the number you’re counting in each time.
    • For example, if you start at 10,000 and are counting in 10,000s, the next number is 10,000 + 10,000 = 20,000.
  3. Use place value to help understand large numbers.
    • Each digit in a number represents a value based on its position (units, tens, hundreds, thousands, etc.).

Tips and Tricks

  • Use a number line. Visualising numbers can help you see the jumps.
  • Practice with your friends! Counting together can make it fun!
  • Break it down. If you find it hard, count in smaller steps first before making larger jumps.

Questions to Practice

Easy Level (Count in 10,000s)

  1. What is 10,000 + 10,000?
  2. What comes after 20,000?
  3. Count in 10,000s starting from 10,000 up to 50,000.
  4. What is 30,000 – 10,000?
  5. What comes before 40,000?
  6. What is 10,000 + 30,000?
  7. What comes after 50,000?
  8. What is 20,000 – 10,000?
  9. Count in 10,000s starting from 0 up to 30,000.
  10. What is 50,000 – 20,000?

Medium Level (Count in 100,000s)

  1. What is 100,000 + 100,000?
  2. What comes after 300,000?
  3. Count in 100,000s starting from 100,000 up to 600,000.
  4. What is 200,000 – 100,000?
  5. What comes before 400,000?
  6. What is 100,000 + 200,000?
  7. What comes after 500,000?
  8. What is 300,000 – 100,000?
  9. Count in 100,000s starting from 0 up to 500,000.
  10. What is 600,000 – 200,000?

Hard Level (Count in 1,000,000s)

  1. What is 1,000,000 + 1,000,000?
  2. What comes after 3,000,000?
  3. Count in 1,000,000s starting from 1,000,000 up to 5,000,000.
  4. What is 2,000,000 – 1,000,000?
  5. What comes before 4,000,000?
  6. What is 1,000,000 + 3,000,000?
  7. What comes after 5,000,000?
  8. What is 3,000,000 – 1,000,000?
  9. Count in 1,000,000s starting from 0 up to 6,000,000.
  10. What is 7,000,000 – 2,000,000?

Answers

Easy Level Answers

  1. 20,000
  2. 30,000
  3. 10,000, 20,000, 30,000, 40,000, 50,000
  4. 20,000
  5. 30,000
  6. 40,000
  7. 60,000
  8. 10,000
  9. 0, 10,000, 20,000, 30,000
  10. 30,000

Medium Level Answers

  1. 200,000
  2. 400,000
  3. 100,000, 200,000, 300,000, 400,000, 500,000, 600,000
  4. 100,000
  5. 300,000
  6. 300,000
  7. 600,000
  8. 200,000
  9. 0, 100,000, 200,000, 300,000, 400,000, 500,000
  10. 400,000

Hard Level Answers

  1. 2,000,000
  2. 4,000,000
  3. 1,000,000, 2,000,000, 3,000,000, 4,000,000, 5,000,000
  4. 1,000,000
  5. 3,000,000
  6. 4,000,000
  7. 6,000,000
  8. 2,000,000
  9. 0, 1,000,000, 2,000,000, 3,000,000, 4,000,000, 5,000,000, 6,000,000
  10. 5,000,000

I hope you enjoy counting in large numbers! Keep practicing, and you’ll be a pro in no time!