1s,10s,100s
What number is in the 10s place?
489
8
What is this Strategy?
489
+ 415
Up and down or traditional (Column)
Solve 235 + 543
778
What number is in the 1s place?
645
5
What is this strategy?
489 + 415
400 + 80+9 400+10+5
a. Adjust Addends
b. Decompose both addends
c. Decompose one addend
d. Skip Counting
b. Decompose both addends
Solve 123 + 689
812
What is the total number of tens in 133 + 456
The answer is 589 so there 8 tens
598 + 236
+2 -2
600 + 234 = 834
a. Adjust Addends
b. Decompose both addends
c. Decompose one addend
d. Skip Counting
A. Adjusting Addends
Decompose both addends to solve
236 + 543
200+ 30+ 6 500 + 40 +3
200+ 500 = 700
30 + 40 = 70
6+3 = 9
700 + 70 + 9 = 770
What is the total number of 100s in 148 + 234?
The answer is 382 so there are 3 hundreds
489 + 415
489 + 400 +10 + 5 = 904
a. Adjust Addends
b. Decompose both addends
c. Decompose one addend
d. Skip Counting
C. decomposing one addend
Adjust the Addends to solve
598 + 252
+ -
598 + 252
+ 2 - 2
600 + 250 = 850
The total number of tens in the sum of 345 + 335 is 7
True or False
False
Solve 234 + 134 using base ten blocks
386
Hundreds / Tens / Ones
Decompose one addend to solve
344 + 292
344 + 200 + 90 + 2
344 + 200= 544
544 + 90 = 634
634 + 2 = 636