...blok 1 contractwerk.gif hoofdrekenen... oefening 7

9 + 20 =
35 + 50 =
74 + 80 =
108 + 10 =
724 + 70 =
465 + 40 =
148 + 50 =
383 + 30 =
615 + 90 =
1 020 + 60 =