grade 2 addition and subtraction strategies. o pen n umber l ine - a ddition 145 + 49 = ___ 145185...
TRANSCRIPT
![Page 1: Grade 2 Addition and Subtraction Strategies. O PEN N UMBER L INE - A DDITION 145 + 49 = ___ 145185 190 194 +40 +5 +4](https://reader036.vdocuments.site/reader036/viewer/2022082713/5697bfdf1a28abf838cb2840/html5/thumbnails/1.jpg)
Grade 2 Addition and Subtraction Strategies
![Page 2: Grade 2 Addition and Subtraction Strategies. O PEN N UMBER L INE - A DDITION 145 + 49 = ___ 145185 190 194 +40 +5 +4](https://reader036.vdocuments.site/reader036/viewer/2022082713/5697bfdf1a28abf838cb2840/html5/thumbnails/2.jpg)
OPEN NUMBER LINE - ADDITION
145 + 49 = ___
145
185 190 194
+40
+5 +4
![Page 3: Grade 2 Addition and Subtraction Strategies. O PEN N UMBER L INE - A DDITION 145 + 49 = ___ 145185 190 194 +40 +5 +4](https://reader036.vdocuments.site/reader036/viewer/2022082713/5697bfdf1a28abf838cb2840/html5/thumbnails/3.jpg)
OPEN NUMBER LINE - SUBTRACTION
91 – 75 = _____
91
16 20 21
-70
-4 -1
![Page 4: Grade 2 Addition and Subtraction Strategies. O PEN N UMBER L INE - A DDITION 145 + 49 = ___ 145185 190 194 +40 +5 +4](https://reader036.vdocuments.site/reader036/viewer/2022082713/5697bfdf1a28abf838cb2840/html5/thumbnails/4.jpg)
EXPANDED FORM - ADDITION
145 100 + 40 + 5 + 49 40 + 9
100 + 80 + 14100 + 80 + 10 + 4 = 194
![Page 5: Grade 2 Addition and Subtraction Strategies. O PEN N UMBER L INE - A DDITION 145 + 49 = ___ 145185 190 194 +40 +5 +4](https://reader036.vdocuments.site/reader036/viewer/2022082713/5697bfdf1a28abf838cb2840/html5/thumbnails/5.jpg)
KEEP ONE /BREAK ONE - SUBTRACTION
91 – 75 = ____
91 – 70 = 21 (Subtract the tens) 21 – 5 = 16 (Subtract the ones)
![Page 6: Grade 2 Addition and Subtraction Strategies. O PEN N UMBER L INE - A DDITION 145 + 49 = ___ 145185 190 194 +40 +5 +4](https://reader036.vdocuments.site/reader036/viewer/2022082713/5697bfdf1a28abf838cb2840/html5/thumbnails/6.jpg)
PARTIAL SUMS - ADDITION
145 + 49 = _____
145+ 49
( add the hundreds) 100 (add the tens) 80 (add the ones) 14
194
![Page 7: Grade 2 Addition and Subtraction Strategies. O PEN N UMBER L INE - A DDITION 145 + 49 = ___ 145185 190 194 +40 +5 +4](https://reader036.vdocuments.site/reader036/viewer/2022082713/5697bfdf1a28abf838cb2840/html5/thumbnails/7.jpg)
STANDARD ALGORITHM
1 8 11145 91
+ 49 - 75194 16