Вычислите устно:
а)
35 + 5;
59 + 1;
87 + 3;
44 + 6;
28 + 12;
б)
43 − 6;
30 − 1;
51 − 4;
27 − 8;
24 − 7;
в)
6 * 7;
9 * 4;
8 * 8;
5 * 9;
9 * 6;
г)
64 * 10;
50 : 10;
70 * 10;
100 : 100;
100 * 100;
д)
72 : 9;
48 : 6;
56 : 7;
81 : 9;
40 : 8.
35 + 5 = 40;
59 + 1 = 60;
87 + 3 = 90;
44 + 6 = 50;
28 + 12 = 40.
43 − 6 = 37;
30 − 1 = 29;
51 − 4 = 47;
27 − 8 = 19;
24 − 7 = 17.
6 * 7 = 42;
9 * 4 = 36;
8 * 8 = 64;
5 * 9 = 45;
9 * 6 = 54.
64 * 10 = 640;
50 : 10 = 5;
70 * 10 = 700;
100 : 100 = 1;
100 * 100 = 10000.
72 : 9 = 8;
48 : 6 = 8;
56 : 7 = 8;
81 : 9 = 9;
40 : 8 = 5.