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M6 A.3.1.1 and A.3.1.3 Practice place value while you wait: e=9.

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Presentation on theme: "M6 A.3.1.1 and A.3.1.3 Practice place value while you wait: e=9."— Presentation transcript:

1 M6 A and A Practice place value while you wait: e=9

2 What we know… rel=0 - Rounding Rap

3 Rounding Rap Yo, this is a story all about how My math got twisted upside down, Id like to take a minute so sit right here Ill tell you how I got from here to there. First find the place, okay get it Arrow to the right, underline the digit, 5 or above, give it a shove-- 4 or less, stay at rest. Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And thats how its done in the rounding game! PEACE OUT!!

4 Estimation is... Estimation is finding a number that is close enough to the right answer. You are not trying to get the exact right answer What you want is something that is good enough (usually in a hurry!)

5 When to use rounding… When the question asks you to estimate. When the question asks about how many…? When an exact answer isnt possible. When an answer is difficult to obtain.

6 Rounding Numbers

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8 Place Value 9 1 2, 4 3 6, 7 8 2, hundred millions ten millions millions hundred thousands ten thousands thousands hundreds tens ones hundred billions ten billions billions

9 First find the place, okay get it 4 7 Circle the number in the tens place.

10 Arrow to the right, underline the digit, 4 7 Draw an arrow to the right of the number. Underline.

11 5 or above, give it a shove-- 4 or less, stay at rest. 4 7

12 5 or above, give it a shove-- 4 or less, stay at rest. 4 7 Add 1 to the tens place.

13 Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And thats how its done in the rounding game! 47 = _____

14 47 rounded to the nearest tens place is Note 47 is closer to 50 on the number line.

15 First find the place, okay get it 3, Circle the number in the thousands place.

16 Arrow to the right, underline the digit, 3, Draw an arrow to the right of the number. Underline.

17 5 or above, give it a shove-- 4 or less, stay at rest. 3, shows us to do what?

18 5 or above, give it a shove-- 4 or less, stay at rest. 3, should stay at rest

19 Flex your muscles like a hero Digits to the right turn to a zero, All the other digits remain the same And thats how its done in the rounding game! 3,259 = _______

20 3,259 rounded to the nearest thousands place is 3,000 3,000 4,0003,259 Note 3,259 is closer to 3,000 on the number line.

21 Round these numbers to the nearest ten. 1) 256 = 2) 39 = 3) 7682 = 4) 956 = 5) 1231 = 6) 344 =

22 Round these numbers to the nearest hundreds. 1) 256 = 2) 3109 = 3) 76,982 = 4) 956 = 5) 1231 = 6) 344 =

23 Round these numbers to the nearest thousands. 1) 1256 = 2) 32,109 = 3) 76,982 = 4) 3956 = 5) 1231 = 6) 3474 =

24 Name the hundreds each is between

25 Name the tens each is between

26 Name the thousands each is between 1.4, , , , , ,598

27 Rounding to a Certain Place Value Estimate by rounding to the nearest ten. What numbers should you use to estimate ? THINK: Which is the nearest ten for 33? Which is the nearest ten for 37?

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29 Estimate by rounding to the nearest ten. What numbers should use to estimate ? A B C D

30 Round each number to the nearest ten and then add. 1, A. 2,000 B. 1,700 C. 2, 090 D. 2, 100

31 Round each number to the nearest ten, and then solve =32 – 12 = = 68 – 22 = =88 – 54 =

32 Nearest Hundred

33 Round each number to the nearest hundred and then add ,964 = A. 3,400 B. 4,100 C. 4,300 D. 4,000

34 Estimate by rounding to the nearest hundred. What numbers should you use to estimate 641 plus 378? A B C D

35 Round each number to the nearest hundred, and then solve =392 – 182 = = 648 – 322 = =858 – 524 =

36 Which of the following should you use to estimate 5,789 – 4,678 to the nearest thousand? A. 5,000 –5,000 B. 6,000- 5,000 C. 6,000-4,000 D. 5,700-4,700

37 Round each number to the nearest thousand and then subtract. 7,345 – 3,446 A. 4,000 B. 3,000 C. 5,000 D. 2,000

38 Round each number to the nearest thousand, and then solve. 4, ,257 =4,832 – 1,222 =4, ,465 = 8,642 – 2,468 =9, ,833 =8,478 – 1,454 =

39 Estimation Remember Estimation is not an exact answer – It should be around the answer, but not exactly it. Round the numbers first, then calculate. Use Mental Math and Rounding to make numbers easier to work with.


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