Can you solve this Anagram? D O N G U N I R

To be able to round a number to the nearest 10,100,1000 L.O. To be able to round a number to the nearest 10,100,1000 By the end of the lesson we will be able to: explain the terms rounding and estimating identify when to round up or down round any number to the nearest 10,100,1000

Rounding is used to approximate or estimate. Numbers can be rounded either up or down Numbers are usually rounded up or down to the nearest 10, 100, 1,000, 10,000, 100,000 or even a 1,000,000!

Rounding Up or down?

round up round down So 15, 16, 17, 18 and 19 round up to 20 Take a look at these number lines. 10 11 12 13 20 14 15 16 17 18 19 If a number ends in a 5, 6, 7, 8 or 9 round up So 15, 16, 17, 18 and 19 round up to 20 21 22 24 20 23 25 26 27 28 29 30 If a number ends in a 1, 2, 3 and 4 round down So 21, 22, 23 and 24 round down to 20 continued

Rounding to the nearest 10 Steps to success When rounding to the nearest 10 there are three main things to remember; Identify the units digit. If the units digit is a 1, 2, 3 or 4 we round down. If the units digit is a 5, 6, 7, 8, or 9 we round up. continued

Identify the units digit. Step 1 in the steps to success Identify the units digit. 1 2 2 5 7 7 3 9 9 7 4 4 9 5 5 2 3 3 continued

Can you see if these numbers need to be rounded up or down? 21 22 23 24 25 26 27 28 29 2 3 3 20 30 Is it closer to 20 or 30? Does it end in a 1, 2, 3 or 4? ROUND DOWN! 31 32 33 34 35 36 37 38 39 3 5 5 30 40 Does it end in a 5, 6, 7, 8 or 9? Is it closer to 30 or 40? ROUND UP! continued

2 7 7 3 7 1 1 7 8 5 5 9 round up round down round up Lets have a go at these; 20 27 30 2 7 7 3 round up 70 71 80 7 1 1 round down 7 80 85 90 8 5 5 9 round up continued

140 143 150 1 4 3 3 1 4 round down 330 334 340 3 3 4 4 round down 3 3 2140 2148 2150 1 4 8 8 2 round up 2 1 5 90 95 100 9 5 5 1 round up

Rounding To the nearest 100

Rounding to the nearest 100 Steps to success Identify the tens digit. If the tens digit is a 1, 2, 3 or 4 we round down. If the tens digit is a 5, 6, 7, 8, or 9 we round up.

There is a similar pattern for rounding numbers to the nearest 100 Identify the tens digit. 3 3 3 9 2 5 5 7 7 2 2 8 9 . 2 5 8 8 1 continued

3 2 2 4 3 6 5 5 8 7 7 3 7 round down round up round down Lets have ago at rounding to the nearest 100. 310 320 330 340 350 360 370 380 390 300 400 3 2 2 4 Is it closer to 300 or 400? 3 round down 610 620 630 640 650 660 670 680 690 600 700 6 5 5 8 Is it closer to 600 or 700? 7 round up 710 720 730 740 750 760 770 780 790 700 800 7 3 Is it closer to 700 or 800? 7 round down continued

1 4 4 9 1 8 8 8 8 9 9 5 5 1 1 round down round up round up And more… 110 120 130 140 150 160 170 180 190 100 200 1 4 4 9 Is it closer to 100 or 200? 1 round down 810 820 830 840 850 860 870 880 890 800 900 8 8 8 8 Is it closer to 800 or 900? 9 round up 910 920 930 940 950 960 970 980 990 900 1000 9 5 5 1 Is it closer to 900 or 1000? 1 round up

Now without the number line! 4 7 7 9 5 2 2 1 1 7 9 8 6 6 1 continued

Can you write down the steps? There is a similar pattern for rounding numbers to the nearest 1000 Can you write down the steps? 3690 to the nearest 1000 is 4000 continued

Round 6,750 to the nearest 1000 6,750 lies between 6,000 and 7,000. 6,100 6,200 6,300 6,400 6,500 6,600 6,700 6,800 6,900 7,000 6,750 6,750 lies between 6,000 and 7,000. 6,750 is closer to 7,000 than to 6,000. Therefore,when 6,750 is rounded to the nearest 1000,it becomes 7,000.

Round 9,492 to the nearest 1000 9,000 9,100 9,200 9,300 9,400 9,500 9,600 9,700 9,800 9,900 10,000 9,492 9,492 lies between 9,000 and 10,000. 9,492 is closer to 9,000 than to 10,000. Therefore,when 9,492 is rounded to the nearest 1000, it becomes 9,000.

Rounding to the nearest 10,100,1000 Remember to ask yourself: Which two numbers can it round to? These two numbers will change according to the nearest what you are rounding to 4,536 Nearest 10  4530 and 4540 Nearest 100  4500 and 4600 Nearest 1000  4,000 and 5,000

Rounding to nearest 10,100,1000 worksheet Homework Rounding to nearest 10,100,1000 worksheet

20 40 640 20 40 190 80 100 550 60 520 250 70 120 370

200 300 8,400 300 500 1,900 700 9,700 5,800 800 5,200 8,600 1000 1,100 3,800

4,000 9,000 2,000 26,000 10,000 5,000 52,000 30,000