Documents

Chapter 2

Description
Estimation
Categories
Published
of 20
All materials on our website are shared by users. If you have any questions about copyright issues, please report us to resolve them. We are always happy to assist you.
Related Documents
Share
Transcript
  15   L e s s o n   2 . 1   Es t i m a t i on    ©    2   0   0   9   M  a  r  s   h  a   l   l   C  a  v  e  n   d   i  s   h   I  n   t  e  r  n  a   t   i  o  n  a   l   (   S   i  n  g  a  p  o  r  e   )   P  r   i  v  a   t  e   L   i  m   i   t  e   d Name: Date: Practice 1 Estimation Find each sum or difference. Then use rounding to check that your answers are reasonable. Round each number to the nearest hundred. Estimation and Number Theory       C        h    a    p     t   e   r Example  534   287 534 + 287 = 821 NumberRounded to the Nearest 100 534 500 287 300 The estimated sum rounded to the nearest 100 is 800. Add: 500   300  800821 is close to 800. So, the answer is reasonable. 1.  515   342 2.  681   519  3.  170   725   333 4.  2,979   814  16 C  h a p t e r    2   E s t i m ation and Number  Theor y    ©    2   0   0   9   M  a  r  s   h  a   l   l   C  a  v  e  n   d   i  s   h   I  n   t  e  r  n  a   t   i  o  n  a   l   (   S   i  n  g  a  p  o  r  e   )   P  r   i  v  a   t  e   L   i  m   i   t  e   d Find each sum or difference. Then use front-end estimation to check that your answers are reasonable. Example  8,630   3,113 8,630 – 3,113 = 5,517 The answer is 5,517. 8 ,630 – 3 ,113 8,000 – 3,000 = 5,0008,630 – 3,113 is about 5,000. 5,517 is close to 5,000.So, the answer is reasonable. 5.  7,930   2,517 6.  3,166   1,625 7.  36,053   11,832 8.  9,705   8,250 Estimate to check that the answer is reasonable.  17   L e s s o n   2 . 1   Es t i m a t i on    ©    2   0   0   9   M  a  r  s   h  a   l   l   C  a  v  e  n   d   i  s   h   I  n   t  e  r  n  a   t   i  o  n  a   l   (   S   i  n  g  a  p  o  r  e   )   P  r   i  v  a   t  e   L   i  m   i   t  e   d Find each product. Then use rounding to check that your answers are reasonable. Round the 3-digit number to the nearest hundred. Example  192   3 192 × 3 = 576The answer is 576. 9.  233   4 10.  485   2 11.  117   5 12.  276   3 NumberRounded to the Nearest 100   3 192 200 × 3 = 600 Name: Date: 576 is close to 600.So, the answer is reasonable. The estimated product rounded to the nearest 100 is 600.  18 C  h a p t e r    2   E s t i m ation and Number  Theor y    ©    2   0   0   9   M  a  r  s   h  a   l   l   C  a  v  e  n   d   i  s   h   I  n   t  e  r  n  a   t   i  o  n  a   l   (   S   i  n  g  a  p  o  r  e   )   P  r   i  v  a   t  e   L   i  m   i   t  e   d Find each product. Then use front-end estimation to check that your answers are reasonable. Example  114   5 114 x 5 = 570The answer is 570. 1 14 x 5 100 x 5 = 500So, 114 x 5 is about 500.The answer 570 is reasonable. 13.  108   3 14.  121   5 15.  439   2 16.  227   4 570 is close to 500. So, the answer is reasonable.
We Need Your Support
Thank you for visiting our website and your interest in our free products and services. We are nonprofit website to share and download documents. To the running of this website, we need your help to support us.

Thanks to everyone for your continued support.

No, Thanks