Chapter 2

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Estimation
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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.

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