Zadanie 2,strona 51,Szkoła podstawowa,klasa 4 (podręcznik)

Oblicz:

a) 69 + 32 – 57             b) 25 x 4 – 37             c) 100 : 10² x 2             d) 2 x 12 + 48 : 4

95 – 72 + 64                     150 – 20 x 4               20 x 45 : 9                    105 – 45 : 3 + 17

102 – 64 + 68                   180 + 92 : 4              450 : 50 x 3²                 180 + 20 x 6 – 56

 

Odpowiedż:

a)

69 + 32 – 57 = 101 – 57 = 44

95 – 72 + 64 = 23 + 64 = 87

102 – 64 + 68 = 102 + 4 = 106

 

b)

25 x 4 – 37 = 100 – 37 = 63

150 – 20 x 4 = 150 – 80 = 70

180 + 92 : 4 = 180 + 23 = 203

 

c)

100 : 10² x 2 = 100 : 100 x 2 = 1 x 2 = 2

20 x 45 : 9 = 20 x 5 = 100

450 : 50 x 3² = 450 : 50 x 9 = 9 x 9 = 81

 

d)

2 x 12 + 48 : 4 = 24 + 12 = 36

105 – 45 : 3 + 17 = 105 – 15 + 17 = 90 + 17 = 107

180 + 20 x 6 – 56 = 180 + 120 – 56 = 300 – 56 = 244