(2) ben 10_rounding[1]
-
Upload
deputymitchell039 -
Category
Documents
-
view
1.349 -
download
5
Transcript of (2) ben 10_rounding[1]
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!)
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
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
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.