Rounding Powerpoint

1st Grade

Michelle Dawson Francois

http://math.phillipmartin.info/math_teacher3.htm

Standard- M1N1. Students will estimate, model, compare, order, and represent whole numbers up to 100.

Element- d. Understand the magnitude and order of numbers up to 100 by making ordered sequences and representing them on a number line.

Essential Question- How can rounding help me solve a difficult problem?

https://www.georgiastandards.org/standards/

When a question asks you to round or estimate, you are being asked “about how many?”

Your approximate number will help you solve problems that maybe hard to solve.

http://math.phillipmartin.info/math_estimate.htm

When rounding to the nearest ten up to 100. Your answer will be one of the numbers below because they are multiples of ten.

0, 10, 20, 30, 40, 50, 60, 70, 80, 90,100

The rule to rounding- 0, 1, 2, 3, 4- round down, 5, 6,7, 8, 9 – round up.

Remembering this poem with the rule will also help you round.

Find your number. Look right next door. 4 or less just ignore. 5 or more, add 1 more.

Yuskaitis, Monica, Rounding –Math Flash, http://math.pppst.com/rounding.html

Remember the poem Find your number. Look right next door. 4 or less just ignore. 5 or more, add 1 more.

2 1

2

7

Round to

20

Round to

30

31 32 33 34 35 36 37 38 39 4030

Remember the poem. Round 36 to the nearest ten.

31 32 33 34 35 36 37 38 39 4030

Round 36 to the nearest ten.The nearest ten to 36 is 40.

71 72 73 74 75 76 77 78 79 8070

Round 74 to the nearest ten.

71 72 73 74 75 76 77 78 79 8070

Round 74 to the nearest ten.The nearest ten to 74 is 70.

Number your paper 1-5. Round the given

number to the nearest ten.

Remember the rule and use it to help you solve.

Get Ready… http://school.phillipmartin.info/school_pencil.htm

1 2 3 4 5 6 7 8 9 100

a. 0b. 10c. 6

11 12 13 14 15 16 17 18 19 2010

a. 20b. 10c. 18

71 72 73 74 75 76 77 78 79 8070

a. 70b. 75c. 80

71 72 73 74 75 76 77 78 79 8070

a. 70b. 75c. 80

91 92 93 94 95 96 97 98 99 100

90

a. 95b. 90

c. 100

1. Round 5 to 10 – answer b 2. Round 19 to 20 – answer a 3. Round 73 to 70 – answer a 4. Round 77 to 80 – answer c 5. Round 92 to 90 – answer b

http://upload.wikimedia.org/wikipedia/commons/thumb/e/eb/Blue_check.svg/600px-Blue_check.svg.png

Essential Question: How can rounding help me solve a difficult problem?

Answer- Rounding gives us an answer close to the correct one which helps us solve hard problems.

Your answer will be a multiples of ten. 0, 10, 20, 30, 40, 50, 60, 70, 80,

90,100

http://journal.media-culture.org.au/0510/images/review-cover.jpg

The rule to rounding- 0, 1, 2, 3, 4- round down, 5, 6,7, 8, 9 – round up.

Find your number. Look right next door. 4 or less just ignore. 5 or more, add 1 more.

http://en.wikipedia.org/wiki/Porky_Pig