Soluciones MATEMÁTICAS (84)

Busca a alguien que te ayude a comprobar tus resultados, entre dos es un momento.

Cálculo mental

97 – 34 = 90 – 30 + 7 – 4 = 63

67 – 45 = 60 – 40 + 7 – 5 = 22

96 – 65 = 90 – 60 + 6 – 5 = 31

58 – 36 = 50 – 30 + 8 – 6 = 22

86 – 52 = 80 – 50 + 6 – 2 = 34

78 – 25 = 70 – 20 + 8 – 5 = 53

49 – 24 = 40 – 20 + 9 – 4 = 25

98 – 74 = 90 – 70 + 8 – 4 = 24

59 – 47 = 50 – 40 + 9 – 7 = 12

34 – 12 = 30 – 10 + 4 – 2 = 22

69 – 18 = 60 – 10 + 9 – 8 = 51

65 – 23 = 60 – 20 + 5 – 3 = 42

77 – 41 = 70 – 40 + 7 – 1 = 36

75 – 34 = 70 – 30 + 5 – 4 = 41

84 – 12 = 80 – 10 + 4 – 2 = 72

47 – 16 = 40 – 10 + 7 – 6 = 31

55 – 13 = 50 – 10 + 5 – 3 = 42

43 – 32 = 40 – 30 + 3 – 2 = 11

Repaso

12+5x4=12+20 =32

3 x (20 – 12) = 3 x 8 = 24

7 x 8 – 16 = 56 – 16 = 40

a) 3.987 x 59 = 235.233 kg

b) 235.233 : 7 = 33604,71429 L 3. 1.230:6=205kg

1.230 : 6 = 205 Kg

2 x 5 x 24 = 240 euros

Los datos que faltan son:

15 euros, 15 x 15 = 225 euros

12 euros, 12 x 20 = 240 euros

54 euros, 54 x 20 = 1.080 euros

33 euros , 33 x 2 = 66 euros

8 euros, 8 x 10 = 80 euros

Total: 1.791 euros

Biodiversos