1. Rounding
Intro to Nearest Whole Number
Nearest Whole Number
Nearest Ten
Nearest Hundred
To 1 Decimal Place
Rounding By Interactive Example
Rounding Seven Questions

2. The “scale” shows numbers between 63 and 64.
Rounding
When you use a tape measure to work out the length of a table often you give the answer to the nearest cm. This is known as ROUNDING
You are often asked to ROUND an answer that you get on a calculator. What is to the nearest Whole Number
63.0
63.1
63.2
63.3
63.4
63.5
63.6
63.7
63.8
63.9
64.0 1 2 3 4 5 6 7 8 9
The “scale” shows numbers between 63 and 64.
Where is 63.91
63.90
63.91
63.92
63.93
63.94
63.95
63.96
63.97
63.98
63.99
64.00
Can you see that is closer to 64.0

3. Rounding 63.91 to a Whole Number
What is to the nearest Whole Number
63.0
63.1
63.2
63.3
63.4
63.5
63.6
63.7
63.8
63.9
64.0 1 2 3 4 5 6 7 8 9
A What two WHOLE numbers is between
63 and 64
B What is the figure after 63 9
9 is called the ROUND FIGURE
The scale can be split into TEN sections using the ROUND FIGURE
If Round Figure is ROUND to 63
Answer 64
If Round Figure is ROUND to 64

4. Round 15.5 to nearest Whole Number
15.5 to nearest whole number is 16 1 5 . 5
Hide the decimal part to get LOW
Step 1 What is LOW 15 1 5 . 5
Whole number
Step 2 Next Figure is Round Figure 5
Round Figure
Step 3 If the Round figure is 0 or 1 or 2 or 3 or 4 then round to LOW
No!
Sep 4 The Round figure is 5 or 6 or 7 or 8 or 9 so round to High
After 15 is 16
ROUND to 16

5. Round 28.3 to Nearest whole number
28.3 to nearest whole number is 28 2 8 . 3
Hide the decimal part to get LOW
Step 1 What is LOW 28 2 8 . 3
Whole number
Step 2 Next Figure is Round Figure 3
Round Figure
Step 3 If the Round figure is 0 or 1 or 2 or 3 or 4 then round to LOW
Yes!
ROUND to 28

6. Round 89 to nearest Ten 89 to nearest Ten 90 8 9
10, 20, 30 ….. Must end in a 0 ….. Figure before Units Plus 0
Step 1 What is LOW 80 8 9
Step 2 Above 1st 0 is Round Figure 9
Round Figure
Step 3 If the Round figure is 0 or 1 or 2 or 3 or 4 then round to LOW
No!
Step 4 The Round figure is 5 or 6 or 7 or 8 or 9 so round to High is 90
ROUND to 90

7. Round 324 to nearest Ten 324 to nearest Ten 320 3 2 4
10, 20, 30 ….. Must end in a 0 ….. Figure before Units Plus 0
Step 1 What is LOW
320 3 2 4
Step 2 1st Figure to be replaced is Round Figure 4
Round Figure
Step 3 If the Round figure is 0 or 1 or 2 or 3 or 4 then round to LOW
Yes!
ROUND to 320

8. Round 1995 to nearest Hundred
200 1 9 9 5
100, 200, 300 ….. Must end in a 00 ….. Figure before Tens Plus 00
Step 1 What is LOW
1900 1 9 9 5
Step 2 Above 1st 0 is Round Figure 9
Round Figure
Step 3 If the Round figure is 0 or 1 or 2 or 3 or 4 then round to LOW
No!
Step 4 The Round figure is 5 or 6 or 7 or 8 or 9 so round to High is
2000
ROUND to 2000

9. Round 9.95 to 1 Decimal Place 10.0 9.95 to 1dp is 9 . 9 5
Cover number then move to the right until there is one figure after the point
Step 1 What is LOW
9.9 9 . 9 5
1dp
Step 2 Next Figure is Round Figure 5
Round Figure
Step 3 If the Round figure is 0 or 1 or 2 or 3 or 4 then round to LOW
No!
Step 4 The Round figure is 5 or 6 or 7 or 8 or 9 so round to High
After 9.9 is
10.0
ROUND to 10.0

10. Round 8.832 to 1 Decimal Place 7.8 7.832 to 1dp is 7 . 8 3 2
Cover number then move to the right until there is one figure after the point
Step 1 What is LOW
7.8 7 . 8 3 2
1dp
Step 2 Next Figure is Round Figure 3
Round Figure
Step 3 If the Round figure is 0 or 1 or 2 or 3 or 4 then round to LOW
ROUND to 7.8

11. Rounding … By Example
600
610
620
630
640
650
660
670
680
690
700 1 2 3 4 5 6 7 8 9 4 6 x 6
672
Round
To Nearest Hundred 6 7 2 8 3 4
Is between
and
Low
High
Click Round Fig
Yes No
Nearest Hundred
(-) √ C x ÷
Show Scale 5 6 7 8 9 + - On
Start 1 2 3 4 . =
Ans

12. ROUND To Nearest Hundred (a) 990 (b) 762 (c) 194 (d) 927 (e) 885 (f)
981
(g)
436
Nearest Hundred
(-) √ C x ÷ 5 6 7 8 9 + - On
Next
Show Ans C 1 2 3 4 . =
Ans

13. Test . . C √ ² 7 8 9 x (-) √ ² C x ÷ 4 5 6 ÷ 5 6 7 8 9 + - 1 2 3 - 1 2
(-)
Ans On C √ 7 8 9 x
(-) √ C x ÷
Test 4 5 6 ÷ 5 6 7 8 9 + - On 1 2 3 - 1 2 3 4 . =
Ans . = +