MENTAL COMPUTATION 1. ADDITION AND SUBTRACTION
MENTAL COMPUTATION
Jan 21, 2016
MENTAL COMPUTATION. 1. ADDITION AND SUBTRACTION. (1). 6 + 5 =. (2). 3 + 9 =. (3). 6 + 6 =. (4). 7 + 7 =. (5). 9 + 8 =. (6). 16 + 63 =. (7). 43 + 12 =. (8). 23 + 19 =. (9). 27 + 47 =. (10). 37 + 34 =. (11). 48 + 24 =. (12). 22 + 59 =. (13). 11 + 70 =. (14). 9 + 43 =. - PowerPoint PPT Presentation
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MENTAL COMPUTATION
MENTAL COMPUTATION
1. ADDITION AND
SUBTRACTION
1. ADDITION AND
SUBTRACTION
6 + 5 =6 + 5 =
(1)(1)
3 + 9 =3 + 9 =
(2)(2)
6 + 6 =6 + 6 =
(3)(3)
7 + 7 =7 + 7 =
(4)(4)
9 + 8 =9 + 8 =
(5)(5)
16 + 63 =16 + 63 =
(6)(6)
43 + 12 =43 + 12 =
(7)(7)
23 + 19 =23 + 19 =
(8)(8)
27 + 47 =27 + 47 =
(9)(9)
37 + 34 =37 + 34 =
(10)(10)
48 + 24 =48 + 24 =
(11)(11)
22 + 59 =22 + 59 =
(12)(12)
11 + 70 =11 + 70 =
(13)(13)
9 + 43 =9 + 43 =
(14)(14)
17 + 18 =17 + 18 =
(15)(15)
97 - 32 =97 - 32 =
(16)(16)
85 - 35 =85 - 35 =
(17)(17)
76 - 42 =76 - 42 =
(18)(18)
99 - 75 =99 - 75 =
(19)(19)
79 - 26 =79 - 26 =
(20)(20)
78 - 35 =78 - 35 =
(21)(21)
51 - 39 =51 - 39 =
(22)(22)
81 - 49 =81 - 49 =
(23)(23)
62 - 37 =62 - 37 =
(24)(24)
55 - 27 =55 - 27 =
(25)(25)
81- = 4081- = 40
(26)(26)
45- = 1545- = 15
(27)(27)
- 80 =16 - 80 =16
(28)(28)
-10 = 54 -10 = 54
(29)(29)
- 50 = 20 - 50 = 20
(30)(30)
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