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Try solving these questions using the left to right method.

1) 76+25=

2) 42+36=

3) 67+58=

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Let’s try Vectors, Clipart & Illustrations for Free Download ...

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Hey friends! My name is Megan Godeke. I am studying to be an elementary teacher. I enjoy working with children and I hope to change their lives for the better.

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Today we will learn or refresh our memory over the different ways to add whole numbers. You'd be surprised of the many ways we can add!

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Watch this video for some ways we can add in our head. Stop the video at 3:30.

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Mental Math Tricks - Addition and Subtraction in your head!

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Watch this video to get the understanding of the Associative Property.

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https://youtu.be/ohn18Ao20VI?si=hdRABGFjIw3brZO-

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Associative Property of Addition | MathHelp.com

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Watch this video to get an understanding of Commutative Property

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Commutative Property of Addition | MathHelp.com

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Try these questions using the method.

1)59+42=

2)76+34=

3)32+67=

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Adding Two Digit Numbers | Mental Math Tricks

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Addition of Whole Numbers: Mental Computation (Adding from the left)

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1) 76+25= 101

70+20=90

6+5=11

90+11=101

2) 42+36= 78

40+30=70

6+2=8

70+8=78

3) 67+58= 125

60+50=110

7+8=15

110+15=125

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Which property do you think this is?

(2+3) +5 = (5+2) + 3

What about this one?

(2+3) +5 = 2+(3+5)

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180+ You Got This Stock Photos, Pictures & Royalty-Free Images ...

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(2+3) + 5 = (5+2) + 3

Commutative Property

(2+3) + 5 = 2 + (3+5)

Associative Property

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Before teaching, these methods were new to me and I found them very interesting! For the following questions, I want you to use both the Left to right method and the breaking up & bridging method. I want you to notice the difference in the two and find the one that you think is easier to use.

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55,100+ Math Clip Art Stock Illustrations, Royalty-Free Vector ...

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1)140+28=

2)64+22=

3)25+32=

4)147+212=

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1)140+28=168

LR: 100+20=120

40+8=48

120+48=168

BB:140+20=160

160+8=168

2)64+22=86

LR: 60+20=80

4+2=6

80+6=86

BB: 64+20=84

84+2=86

3)25+32=57

LR:20+30=50

5+2=7

50+7=57

BB: 25+30=55

55+2=57

4)147+212=359

LR:100+200=300

40+10=50

7+2=9

300+50+9=359

BB:147+200=347

347+12=359

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1)59+42=101

59+40=99

99+4=101

2)76+34=110

76+30=106

106+4=110

3)32+67=99

32+60=92

92+7=99

How did you do?