Front End & Rounding Gwendolyn Best Suffolk Public

Front End & Rounding Gwendolyn Best Suffolk Public

Front End & Rounding Gwendolyn Best Suffolk Public Schools Estimation The next few slides will help you test your estimation skills. Can I buy three for $100? 45 Can I buy three for $100? $23

Can I buy 5 for $50? The basketball would have to cost ______ or less for me to purchase five of them for $50. Can I buy three for $20? 4.95 $ Rounding to the highest Place Value t

s e h hig s t i to r e b e m m u o n S h c

. a e n e u e l t d a Roun le place v unded to reds, o b r d i n s e

u s b h o l , p il s w d s n r a e s b u

o m h u n ,t s d n a s u o th . s n e or t

375+ 26 + 1,427 + 216 375 Hundreds 26 Tens 1,427 216 Thousands Hundreds Round to the highest place. 375 Hundreds

400 26 Tens 30 1,427 216 Thousands Hundreds 1,000 200 After you round, add the numbers! 400

30 1000 + 200 1630 4758 8857 9000 5000 4758 7045 7000 7045 2110 + + 2110

2000 8857 + 9000 Between 11,000 and 15,000 5000 Between 16,000 and 20,000 7000 +2000 Between 20,000 and 25,000 Between 28,000 and 33,000

247 6542 + 247 200 7000 6542 489 489 500 92 + + 92 90

200 7000 500 + 90 A little less than 7,000 A little less than 8,000 A little more than 8,000

A little more than 10,000 5028 5028 5000 6732 6732 7000 1285 1285 1000 + 835 835

++ 800 Front End Estimation FRONT END The name of this strategy gives you a clue about how it is used. The word FRONT should remind you that you are only concerned with the front portion of the number. Many people think this strategy is easier than rounding to the highest place value. Draw a line through your list of numbers so that you have at least one digit from each addend in front of (before) the line. 4,329 4,32 0

748 74 0 2,398 + 28 2,39 0 + 20 all e g Chan rs be

m u e n n i l e th r e t f a s. o r e to z ers

b m u All n the re o f e e b h t y ta s e n li . e

m a s 375+ 26 + 1,427 + 216 375 26 37 0 20 1,427 1,42 0 216 21 0

4758 8857 8000 4000 4758 7045 7000 7045 2110 + + 2110 2000 8857 +

4758 8857 8000 4000 4758 7045 7000 7045 2110 + + 2110 2000 8857

+ Draw the line after the first number In each addend. 8000 Between 11,000 and 15,000 4000 Between 16,000 and 20,000 7000 +2000 Between 20,000 and 25,000 Between 28,000 and 33,000

247 6542 + 247 240 6540 6542 489 489 480 92 + + 92 90

Estimate to find the best answer. 240 6540 480 + 90 7350 A little more than 7,000 A little more than 8,000 A little less than 9,000

A little less than 10,000 5028 5028 5000 6732 6732 6700 1285 1285 1200

+ 835 835 ++ 800 Estimate and choose the most reasonable answer. 5000 Between 11,000 and 15,000 6700 Between 16,000 and 20,000 1200 Between 20,000 and 25,000

+ 800 13700 Between 28,000 and 33,000 3,876 4,000 3,000 5,814 6,000 5,000 3,176 3,000

3,000 + 7,895 + 8,000 + 7,000 9,876 9,000 10,000 8,514 8,000 9,000

6,092 6,000 6,000 + 3,895 + 3,000 + 4,000

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