There’s something you didn’t know about Ben Ten…

It’s something that he really can’t stand…

He can’t stand the units in

numbers…

I like to see the BIG picture. When I look at data I need information, and I need it fast. I need to estimate about how

many monsters there are.

To do this I need to round numbers up or down to the nearest 10… or sometimes

even to the nearest 100. (I’m not called Ben 10

for no reason, you know!)

26 evil baddies bah!!!! I want to know which tens number 26 is nearest to.

20 3026

Can you think of some rules for rounding up and down?Which numbers round down?Which numbers round up? What about numbers ending in 5?

0 101 2 3 4 5 6 7 8 9

Round some numbers to the nearest 10.

130 evil baddies! How will I cope! Now I want to round numbers to the nearest hundreds number.

100 200130

How could you change the rules that you made for rounding to the nearest hundred?Which tens numbers round down?Which tens numbers round up? What about 50?

0 10010 20 30 40 50 60 70 80 90

Round some some numbers to the nearest 100.

In your numeracy books, complete these rounding questions. Set it out like the example on the right.

1. 23 20

2. 57 60

Round to the nearest 10.

Round to the nearest 100.

1. 48

2. 99

3. 49

4. 9

5. 52

6. 97

7. 44

8. 85

9. 42

10. 73

11. 84

12. 35

13. 5

14. 78

15. 72

16. 79

17. 44

18. 14

19. 33

20. 31

21. 151

22. 169

23. 232

24. 262

25. 308

26. 143

27. 318

28. 475

29. 464

30. 337

31. 395

32. 226

33. 383

34. 349

35. 460

36. 408

37. 297

38. 95

39. 406

40. 377

If you need to help yourself, use a number

line or a number square.