subtraction: adding up
DESCRIPTION
Subtraction: Adding UP. Category 1. The whole is a multiple of ten. 20 – 15 20 – 14 20 – 12 20 – 11. 20 – 10 20 – 9 20 – 7 20 – 8. 30 – 25 30 – 23 30 – 15 30 – 12. 30 – 19 3 0 – 14 3 0 – 24 3 0 – 21. 4 0 – 34 4 0 – 29 4 0 – 20 4 0 – 18. 4 0 – 32 - PowerPoint PPT PresentationTRANSCRIPT
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Subtraction: Adding UP
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Category 1
The whole is a multiple of ten.
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20 – 1520 – 1420 – 1220 – 11
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20 – 1020 – 920 – 720 – 8
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30 – 2530 – 2330 – 1530 – 12
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30 – 1930 – 1430 – 2430 – 21
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40 – 3440 – 2940 – 2040 – 18
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40 – 3240 – 2840 – 1940 – 24
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50 – 3950 – 4450 – 2450 – 33
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60 – 4960 – 2960 – 3960 – 19
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70 – 5970 – 3470 – 4970 – 18
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Category 2
The whole is a no longer multiple of ten but is below fifty.
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15 – 915 – 915 – 915 – 9
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21 – 1021 – 921 – 7 21 – 8
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25 – 1925 – 1625 – 1825 – 9
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23 – 1923 – 1623 – 1423 – 9
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31 – 2931 – 2631 – 2431 – 15
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32 – 2832 – 2532 – 1932 – 15
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44 – 3944 – 3544 – 2944 – 25
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41 – 3441 – 2841 – 2441 – 19
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23 – 1933 – 1942 – 2941 – 18
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Category 3
Mixture of numbers that lend themselves to the Adding Up Strategy
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20 – 1424 – 1922 – 1326 – 17
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30 – 1533 – 1933 – 1436 – 27
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40 – 1945 – 1942 – 2342 – 34
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50 – 2450 – 3956 – 2856 – 17
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60 – 4960 – 2763 – 5663 – 19
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70 – 6170 – 3474 – 4974 – 36
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80 – 3980 – 6881 – 4981 – 58
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90 – 7990 – 7492 – 8992 – 69
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100 – 97100 – 89100 – 49100 – 24