Rounding Intro 63.91 to Nearest Whole Number Nearest Whole Number Nearest Ten Nearest Hundred To 1 Decimal Place Rounding By Interactive Example Rounding Seven Questions

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 63.91 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 63.91 is closer to 64.0

Rounding 63.91 to a Whole Number What is 63.91 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 63.91 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 01234 ROUND to 63 Answer 64 If Round Figure is 56789 ROUND to 64

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

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

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 80 + 10 is 90 ROUND to 90

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

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 1900 + 100 is 2000 ROUND to 2000

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

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

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

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

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