WELCOME TO MATH WITH MRS. CROSS M6 A.3.1.1 and A.3.1.3 Practice place value while you wait: http://www.toonuniversity.com/flash.asp?err=4 96&engine=9 What we know http://www.youtube.com/embed/3uEafe1r4GI?

rel=0 - Rounding Rap 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!! 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!) 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. Rounding Numbers Numbers 1 4 = ROUND DOWN Numbers 5 9 = ROUND UP Rounding Numbers Numbers 1 4 = ROUND DOWN

Numbers 5 9 = ROUND UP Round 89 Round 14 Round 36 ones tens

hundreds thousands ten thousands hundred thousands millions

ten millions hundred millions billions ten billions hundred billions

Place Value 9 1 2 , 4 3 6 , 7 8 2, 0 5 1 Watch me: Round to the nearest tens place: First find the place, okay get it 47 Circle the number in the tens

place. Round to the nearest tens place: Arrow to the right, underline the digit, 47 Draw an arrow to the right of the number. Underline.

Round to the nearest tens place: 5 or above, give it a shove-4 or less, stay at rest. 47 Round to the nearest tens place: 5 or above, give it a shove-4 or less, stay at rest.

47 Add 1 to the tens place. Round to the nearest tens place: 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 = _____ The Answer 47 rounded to the nearest tens place is 40 50 47

50 Note 47 is closer to 50 on the number Round to the nearest thousands place: First find the place, okay get it 3, 2 5 9 Circle the number in the thousands

place. Round to the nearest tens place: Arrow to the right, underline the digit, 3, 2 5 9 Draw an arrow to the right of the number. Underline.

Round to the nearest tens place: 5 or above, give it a shove-4 or less, stay at rest. 3, 2 5 9 2 shows us to do what? Round to the nearest tens place:

5 or above, give it a shove-4 or less, stay at rest. 3, 2 5 9 2 should stay at rest Round to the nearest tens place: 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 = _______ The Answer 3,259 rounded to the nearest thousands place is 3,000

3,259 3,000 4,000 Note 3,259 is closer to 3,000 on the number line. Round these numbers to the nearest ten. 1) 256 =

2) 39 = 3) 7682 = 4) 956 = 5) 1231 = 6) 344 = Round these numbers to the nearest hundreds. 1) 256 = 2) 3109 =

3) 76,982 = 4) 956 = 5) 1231 = 6) 344 = Round these numbers to the nearest thousands. 1) 1256 = 2) 32,109 = 3) 76,982 =

4) 3956 = 5) 1231 = 6) 3474 = Name the hundreds each is between 1. 516 2. 809 3. 447 4. 782 5. 124

6. 450 Name the tens each is between 1. 84 2. 33 3. 58 4. 91 5. 23 6. 15

Name the thousands each is between 1. 4,309 2. 6,500 3. 2,833 4. 5,432 5. 1,875 6. 3,598 Rounding to a Certain Place Value Estimate by rounding to the nearest ten. What

numbers should you use to estimate 33 + 37? THINK: Which is the nearest ten for 33? 30 31 32 33 34 35 36 37 38 39 40 Which is the nearest ten for 37? Estimate by rounding to the nearest ten. What numbers should use to estimate 56 + 67?

A. B. C. D. 50+60 50+70 60+60 60+70

Round each number to the nearest ten and then add. 1,357 + 729 A. 2,000 B. 1,700 C. 2, 090 D. 2, 100 Round each number to the nearest ten, and then solve. 48 + 57 =

32 12 = 45 + 15 = 68 22 = 93 + 33 = 88 54 =

Nearest Hundred Nearest Hundred Round each number to the nearest hundred and then add. 274 + 3,964 = A. 3,400 B. 4,100 C. 4,300

D. 4,000 Estimate by rounding to the nearest hundred. What numbers should you use to estimate 641 plus 378? A. 700 + 400 B. 600 + 400 C. 700 + 300 D. 600 + 300

Round each number to the nearest hundred, and then solve. 243 + 517 = 392 182 = 405 + 195 = 648 322 = 973 + 313 =

858 524 = Which of the following should you use to estimate 5,789 4,678 to the nearest thousand? A. B. C. D.

5,000 5,000 6,000- 5,000 6,000-4,000 5,700-4,700 Round each number to the nearest thousand and then subtract. 7,345 3,446 A.

B. C. D. 4,000 3,000 5,000 2,000 Round each number to the nearest thousand, and then solve.

4,218 + 1,257 = 4,832 1,222 = 4,985 + 1,465 = 8,642 2,468 = 9,093 + 6,833 =

8,478 1,454 = 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.