d2y1pz2y630308.cloudfront.net

d2y1pz2y630308.cloudfront.net

Math Lessons for the Week of Sept. 9 Ms. Hernandez 4A Monday, September 9th: Addition Strategies Commutative Property of Addition: Identity Property of Addition: Changing the order of the addends does not the same The sum of zero and a number is change the sum. as that number. 4+3=7

6+0=6 3+ 4 = 7 0+6=6 Associative Property of Addition: Changing the grouping of the addends does not change the sum. *Always do the computation in the parentheses first (6 + 9) + 2 = 17 Monday, September 9th: Addition Strategies 4 5 9

1 10 3 13 13 To make adding easier, you can add up or add down. 4 5 1 3

13 13 9 4 Add numbers that follow the associative property of addition through order and grouping. Tuesday, September 10th: Rounding Number: 74,826 Any number before the underlined digit stays the same

5 and up: goes up 1 4 and below: stays the same 74,826 To figure out how to round the underlined digit, you look to the number to the RIGHT. After rounding the underlined digit, the rest of the numbers to the right of the number all become ZERO (0) [including the number to

the right of the underlined digit] Answer: 75,000 Wednesday, September 11th: Halfway Point and Numberlines +10 0 +10 10 20 If a number is not equally in the center of the given points than it is not the halfway point. To make sure that a number is

the halfway point, it has to be EQUALLY between the two given points. +15 0 +5 15 20 Friday, September 13th: Quiz Questions: 10 Addition Strategies 5 Rounding 5 Halfway Point Quiz Review Give the sum of the equation as well as the STRATEGY (property of addition). For the associative, show the addition method with order and grouping:

7+4= 8 10 + 0 = 5 (5+8) + 7 = 4 2 Quiz Review Round each number to the place of the underlined digit. 72,729 829,012 1,382,921 52,922,383 Quiz Review Find the halfway point of the two given points and draw a numberline.

0; 300 10; 90 1000; 2000 Quiz Review Answers Give the sum of the equation as well as the STRATEGY (property of addition). For the associative, show the addition method with order and grouping: 7 + 4 = 11 Commutative 10 + 0 = 10 identity (5+8) + 7 = 13 8 5 13 17 4 20 Associative 2

19 19 associativ e Quiz Review Answers Round each number to the place of the underlined digit. 72,729 73,000 829,012 829,000 1,382,921 1,400,000 52,922,383 50,000,000 Quiz Review Answers Find the halfway point of the two given points and draw a numberline. 0; 300 0 +15 0

150 +15 0 300 10; 90 10 1000; 2000 1000 +40 +40 50 +50

0 1500 90 +50 0 2000

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