Løsning del 1 utrinn Vår 11

Del 1

Oppgave 1:

a) 269 + 179 = 448
b) 753 - 129 = 624
c) 23 <tex>\cdot</tex> 45 = 1035
d) 22,4 : 7 = 3,2

Oppgave 2:

a) 240 min = 4 timer
b) 20000 meter = 20 kilometer
c) 50 centiliter = 0,5 liter
d) <tex>200 dm^2 = 2 m^2 </tex>

Oppgave 3:

a)<tex>3 + 2 \cdot 5+2^3 = 3 + 10 + 8 = 21</tex>
b)<tex> -3^2 \cdot (-3)^2 = - 9 \cdot 9 = - 81</tex>

Oppgave 4:

a)<tex> \frac 27 + \frac 47 = \frac {2+4}7 = \frac 67</tex>

b)<tex> \frac 32 - \frac 34 = \frac 64 - \frac 34 = \frac{6-3}{4} = \frac 34</tex>

c)<tex> \frac 49 \cdot \frac 12 \cdot \frac 32 = \frac{4 \cdot 1 \cdot 3}{9 \cdot 2 \cdot 2} = \cdot {12}{36}= \frac{1}{3}</tex>

d) <tex> \frac 56:\frac{10}{6} = \frac {5\cdot6}{6\cdot10} = \frac{30}{60} = \frac12</tex>