Rounding

key notes:

1. What is Rounding?
  • Rounding means making a number simpler but keeping it close to the original value.
  • It helps us to estimate or quickly calculate.
🎯 Why Do We Round Numbers?
  • To make numbers easier to work with
  • For quick mental math
  • To estimate answers while shopping, measuring, etc.
🧠 Basic Rounding Rule

👉 Underline the digit you are rounding.
👉 Look at the digit to its right:

If the digit isDo this
0, 1, 2, 3, 4Round down (keep it same)
5, 6, 7, 8, 9Round up (add 1)

👉 Replace digits after with zeros.

🔟 Rounding to the Nearest 10
  • Example:
    76 → ?
    Look at the ones place → 6 → Round up
    ✅ 76 → 80
  • Example:
    43 → ?
    Look at the ones place → 3 → Round down
    ✅ 43 → 40
💯Rounding to the Nearest 100
  • Example:
    267 → ?
    Look at the tens place → 6 → Round up
    ✅ 267 → 300
  • Example:
    432 → ?
    Look at the tens place → 3 → Round down
    ✅ 432 → 400
🧮 Rounding to the Nearest 1000
  • Example:
    6,782 → ?
    Look at the hundreds place → 7 → Round up
    ✅ 6,782 → 7,000
  • Example:
    3,210 → ?
    Look at the hundreds place → 2 → Round down
    ✅ 3,210 → 3,000
📝 Practice Questions

Round the following:

  1. 64 to the nearest 10 → ______________
  2. 348 to the nearest 100 → ______________
  3. 5,499 to the nearest 1,000 → ______________
  4. 1,555 to the nearest 100 → ______________
✨ Key Tips to Remember

Replace the digits after rounding place with zeros

Always look at the digit to the right of the place you’re rounding.

Numbers ending in 5 or more → round up

Numbers ending in 4 or less → round down

Learn with an example

🔥What is 28,085 rounded to the nearest ten?

First, find the digit in the tens place. This is the place you want to round:

28,085

Now look one place to the right:

28,085

This number is 5, so you will round up. First, replace all the digits to the right of the tens place by zeroes:

28,085 → 28,080

Now add 1 to the other part of the number:

28,080 → 28,090

🔥What is 10,134 rounded to the nearest hundred?

First, find the digit in the hundreds place. This is the place you want to round:

10,134

Now look one place to the right:

10,134

3 is less than 5, so you will round down. Replace all the digits to the right of the hundreds place by zeroes:

10,134 → 10,100

🔥What is 60,839 rounded to the nearest thousand?

First, find the digit in the thousands place. This is the place you want to round:

60,839

Now look one place to the right:

60,839

8 is greater than 5, so you will round up. First, replace all the digits to the right of the thousands place by zeroes:

60,839 → 60,000

Now add 1 to the other part of the number:

60,000 → 61,000

🔥What is 30,701 rounded to the nearest ten thousand?

First, find the digit in the ten-thousands place. This is the place you want to round:

30,701

Now look one place to the right:

30,701

0 is less than 5, so you will round down. Replace all the digits to the right of the ten-thousands place by zeroes:

30,701 → 30,000

Let’s practice!