Rounding Numbers Year 6 Objective To round a
Rounding Numbers Year 6 Objective: To round a number to its nearest 10, 100 or 1000
Keywords • Units (U) • Tens (T) • Hundreds (H) • Thousand (Th) • Rounding • Nearest • Digit
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Exact number or Rounded? A race judge says: Well done everyone, the winner took about 10 seconds.
Exact number or Rounded? Athletes want exact times, correct to parts of a second! The race judge should say: well done, the winner finished in 10. 26 seconds.
Exact number or Rounded? A man asks a policeman the time: It is 23 seconds past 9. 16 am on 1 st April 2019 AD.
Exact number or Rounded? Too much information! The policeman should round the time to the nearest quarter of an hour: it’s about a quarter past nine.
Exact number or Rounded? A customer asks the cashier how much their bill comes to: your bill is about € 40.
Exact number or Rounded? Oh dear, that’s not good enough. The customer needs to know exactly what their bill comes to. The cashier should say: your bill comes to € 38. 82, please.
Rounding to the nearest 10 Round 467 to the nearest ten. 0 500 250 467 400 500 450 467 rounds to 470 467 460 470 465 467
Rounding to the nearest 100 Round 1467 to the nearest ten. 0 2000 1467 1000 2000 1500 1467 1400 1467 rounds to 1500 1450 1467
Rounding to the nearest 1000 Round 2467 to the nearest ten. 1000 3000 2467 2000 2500 2467 3000 2467 rounds to 2000
Find the place value and circle that digit Round 2, 311 to the nearest hundred. Circle the number in the hundreds place 2, 311
Move to the right, Underline it Look to the right of the number we have circled 2, 311 Underline the number in the tens place.
0 through 4 Circle stays the same If the number we underlined is 0, 1, 2, 3, or 4, we leave the number in the circle as it is. 2, 311
Digits to the right change to ZERO All the digits to the right of the number in the circle, change to ZERO 2, 300
x 2, 300 2, 350 2, 400 2, 311 is closer to 2, 300 rather than 2, 400
Find the place value and circle that digit Round 2, 372 to the nearest thousand 2, 372
Move to the right, Underline it Look to the right of the number we have circled 2, 372 Underline the number in the tens place.
0 through 4 Circle stays the same If the number we underlined is 0, 1, 2, 3, or 4, we leave the number in the circle as it is. 2, 372
5 through 9, Add 1 in this game If the number we underlined is 5, 6, 7, 8, or 9 we add 1 to the number in the circle. 2, 472
Digits to the right change to ZERO All the digits to the right of the number in the circle, change to ZERO 2, 400
x 2, 300 2, 350 2, 400 2, 372 is closer to 2, 400 rather than 2, 300.
What did you get when you rounded 3, 416 to the nearest TEN? 3, 420 34 3, 400 3, 500
You’re Right! GREAT JOB!
Round 4, 642 to the nearest Hundred 4, 600 4, 700 4, 650 5, 000
You’re Right! GREAT JOB!
Round 7, 652 to the nearest Thousand 7, 600 7, 650 8, 000 6, 000
You’re Right! GREAT JOB!
Rounding nearest 1000
Rounding nearest 1000
Things to think about… • When do we use rounding in our everyday lives? • Why do we round numbers?
- Slides: 33
