Rounding - PowerPoint PPT Presentation

1 / 18
About This Presentation
Title:

Rounding

Description:

Rounding. Understand how to round numbers to the nearest 10, ... Discus. 21.95 m. Shot-put. 7.48 m. Long Jump. 2.09 m. High Jump. Women's events. Take Care! ... – PowerPoint PPT presentation

Number of Views:47
Avg rating:3.0/5.0
Slides: 19
Provided by: ASB79
Category:
Tags: discus | rounding

less

Transcript and Presenter's Notes

Title: Rounding


1
Rounding
  • Understand how to round numbers to the nearest
    10, whole number or decimal place.

2
Starter order decimals
  • Which value is the bigger?

4.17km
0.84
0.325
0.345
0.72
11.7
7.30cm
11.57
7.03cm
4.162km
3
Starter order decimals
  • Put these in order, smallest first.

0.231
0.213
0.132
0.123
0.312
4
What is the value
3 4 5
5
Round the following number to 1dp
Now look at the number immediately after where we
stopped highlighting
If this number is a 0, 1, 2, 3 or 4 we dont have
to do anything else and we have our answer.
  • 6.348

Firstly, highlight the number to the first number
after the decimal point
So we have 6.3 But is this the answer?
6
Round the following number to 1dp
  • 6.348 6.3 (1dp)

7
What if the red number was a 5, 6, 7, 8 or 9?
  • Lets look at an example

8
Round the following number to 1dp
Now look at the number immediately after where we
stopped highlighting
If this number is a 5, 6, 7, 8 or 9 we increase
the last digit by one.
  • 9.2721

Firstly, highlight the number to the first number
after the decimal point
So we have 9.2 But is this the answer?
So 9.2 becomes 9.3
9
Round the following number to 1dp
  • 9.2721 9.3 (1dp)

10
Roundingto the nearest whole number
  • Is the arrow nearer to 6, 7 or 8?
  • If it is halfway between, then round UP

6 7 8
11
Round these city populations to the nearest
million
  • Mexico City 21.5 million
  • Sao Paulo 19.9 million
  • Tokyo 19.5 million
  • New York 15.7 million

12
Roundingto the nearest 10
  • Is the arrow nearer to 20, 30 or 40?
  • If it is halfway between, then round UP

20 30 40
13
What is the volume of liquid to the nearest 10
millilitres
14
Roundingto the nearest 100
  • Is the arrow nearer to 400 or 500?
  • If it is halfway between, then round UP

400 500
15
What is the mass of flour to the nearest 100g?
  • Estimate the value to the nearest 10g

16
Rounding to 1 decimal place
  • What value is the arrow pointing at?
  • Is it nearer to 1.4 or 1.5?

1.4 1.5
17
Rounding heights distances
  • Round each of these winning heights distances
    to the nearest whole number
  • Round them to one decimal place (1 d.p.)

18
Take Care!
  • Round 3.48 to 1 d.p

3.5
  • Round 3.48 to the nearest whole number

3 (not 4)
Write a Comment
User Comments (0)
About PowerShow.com