Mental Subtraction using addition in reverse.

Description

Develop skill to automatically respond to subtraction facts by using addition facts in reverse. This will require the development and use of a previous skill to be able to automatically respond to any one of the four forms of an addition fact "family".
Bruce Akitt
Flashcards by Bruce Akitt, updated more than 1 year ago
Bruce Akitt
Created by Bruce Akitt over 11 years ago
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Resource summary

Question Answer
18 - 9 = ___ Think: 18 = 9 + _9_ So: 18 - 9 = _9_
17 - 8 = ___ Think: 17 = 8 + _9_ So: 17 - 8 = _9_
16 - 7 = ___ Think: 16 = 7 + _9_ So: 16 - 7 = _9_
15 - 6 = ___ 15 - 6 = _9_
14 - 5 = ___ 14 - 5 = _9_
13 - 4 = ___ 13 - 4 = _9_
12 - 3 = ___ 12 - 3 = _9_
11- 2 = ___ 11- 2 = _9_
10 - 1 = ___ 10 - 1 = _9_
16 - 8 = ___ 16 - 8 = _8_
15 - 7 = ___ 15 - 7 = _8_
10 - 1 = ___ 10 -1 = _9_
14 - 6 = ___ 14 - 6 = _8_
13 - 5 = ___ 13 - 5 = _8_
12 - 4 = ___ 12 - 4 = _8_
11 - 3 = ___ 11 - 3 = _8_
10 - 2 = ___ 10 - 2 = _8_
9 - 1 = ___ 9 - 1 = _8_
14 - 7 = ___ 14 - 7 = _7_
13 - 6 = ___ 13 - 6 = _7_
12 - 5 = ___ 12 - 5 = _7_
11 - 4 = ___ 11 - 4 = _7_
10 - 3 = ___ 10 - 3 = _7_
9 - 2 = ___ 9 - 2 = _7_
8 - 1 = ___ 8 - 1 = _7_
12 - 6 = ___ 12 - 6 = _6_
11 - 5 = ___ 11 - 5 = _6_
10 - 4 = ___ 10 - 4 = _6_
9 - 3 = ___ 9 - 3 = _6_
8 - 2 = ___ 8 - 2 = _6_
7 - 1 - ___ 7 - 1 = _6_
10 - 5 = ___ 10 - 5 = _5_
9 - 4 = ___ 9 - 4 = _5_
8 - 3 = ___ 8 - 3 = _5_
7 - 2 = ___ 7 - 2 = _5_
6 - 1 = ___ 6 - 1 = _5_
8 - 4 = ___ 8 - 4 = _4_
7 - 3 = ___ 7 - 3 = _4_
6 - 2 = ___ 6 - 2 = _4_
5 - 1 = ___ 5 - 1 = _4_
6 - 3 = ___ 6 - 3 = _3_
5 - 2 = ___ 5 - 2 = _3_
4 - 1 = ___ 4 - 1 = _3_
4 - 2 = ___ 4 - 2 = _2_
3 - 1 = ___ 3 - 1 = _2_
17 - 9 = ___ 17 - 9 = _8_
16 - 9 = ___ 16 - 9 = _7_
15 - 9 = ___ 15 - 9 - _6_
14 - 9 = ___ 14 - 9 = _5_
13 - 9 - ___ 13 - 9 = _4_
12 - 9 = ___ 12 - 9 = _3_
11- 9 - ___ 11 - 9 = _2_
10 - 9 = ___ 10 - 9 = _1_
15 - 8 = ___ 15 - 8 = _7_
14 - 8 = ___ 14 - 8 = _6_
13 - 8 = ___ 13 - 8 = _5_
12 - 8 = ___ 12 - 8 = _4_
11 - 8 = ___ 11 - 8 = _3_
10 - 8 = ___ 10 - 8 = _2_
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