1 Round the Subtrahend to a Multiple of 10 and Adjust 63 28 63 30 33 33 2 35 1 Round the Subtrahend to a Multiple of 10 and Adjust 81 47 2 Decompose the Subtrahend ID: 780855
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Slide1
SIX SUBTRACTION STRATEGIES
Slide2#1 Round the Subtrahend to a Multiple of 10 and Adjust:63 – 28 =
63 – 30 = 33
33 + 2 = 35
Slide3#1 Round the Subtrahend to a Multiple of 10 and Adjust:81 – 47 =
Slide4#2 Decompose the Subtrahend63 - 28
63 – 20 = 43
43 – 3
= 40
40
– 5 = 35
Slide5#2 Decompose the Subtrahend Another Way63 - 28
63 –
3
=
60
60
–
20
= 40
40
– 5 = 35
Slide6#2 Decompose the Subtrahend81 – 49 =
Slide7#3 Add Instead63 - 28
58
+ 2 = 60
28 + 30 = 58
60 + 3 = 30
30 + 2 + 3 = 35
Slide828
58
+ 30
60
+ 2
63
+ 3
30 + 2 + 3 = 35
Slide9#3 Add Instead 2nd Way
63 - 28
30
+ 30 = 60
28 + 2 = 30
60 + 3 = 30
2
+ 30 + 3 = 35
Slide1028
30
+ 30
60
+ 2
63
+ 3
2
+ 30 + 3 = 35
Slide11#3 Add Instead95 - 46
Slide12#4 Same Difference63 - 28
+ 2
+ 2
65 - 30
28
63
+ 2
+ 2
30
65
Slide13#4 Same Difference63 - 28
+ 2
+ 2
65 - 30
28
63
+ 2
+ 2
30
65
35
Slide14#4 Same Difference100 - 37
- 1
- 1
99
-
36
37
100
-
1
- 1
36
99
63
Slide15#5 Break Apart by Place (Start on the Left)
63 – 28
6 3
2 8
-
40 – 5 = 35
40
- 5
Slide16#5 Break Apart by Place(Start on the Left)
93 - 27
Slide17#5 Break Apart by Place(Start on the Left)
524 - 189
Slide18#6 Standard Algorithm63 - 28
5 tens or 50 and 13 ones
Change 63 into
6 3
2 8
-
5
13
35
Slide19#6 Standard Algorithm17 - 9
17
9
-
0
17
8