Verwende Klammern: Fasse die Additionen und die Subtraktionen zusammen!
1. 45 – 23 + 55 – 15 – 22 =
2. 200 – 79 + 23 – 94 =
3. 95 – 62 – 18 – 12 + 30 =
4. 230 + 27 – 85 – 25 – 13 =
5. 120 – 99 + 26 + 18 – 19 – 12 =
6. 7800 – 345 – 730 – 99 =
7. 350 – 120 – 59 + 156 + 12 – 36 =
8. 2000 – 780 + 220 – 350 – 199 =
9. 454 – 48 + 32 – 92 + 24 =
10. 450 – 225 – 98 + 23 – 150 =
11. 567 – 234 + 78 – 93 + 56 + 23 =
12. 870 – 159 + 67 – 149 – 289 + 25 =
Lösungen
1. 45 – 23 + 55 – 15 – 22 =
= 45 + 55 – (23 + 15 + 22) =
=100 – 60 = 40 2. 200 – 79 + 23 – 94 =
= 200 + 23 – (79 + 94) =
= 223 – 173 = 50
3. 95 – 62 – 18 – 12 + 30 =
= 95 + 30 – (62 + 18 + 12) =
= 125 – 92 = 33
4. 230 + 27 – 85 – 25 – 13 =
= 230 + 27 – (85 + 25 + 13) =
= 257 – 123 = 134
5. 120 – 99 + 26 + 18 – 19 – 12 =
= 120 + 26 + 18 – (99 + 19 + 12) =
=164 – 130 = 34
6. 7800 – 345 – 730 – 99 =
= 7800 – (345 + 730 + 99) =
= 7800 – 1174 = 6626
7. 350 – 120 – 59 + 156 + 12 – 36 =
= 350 + 156 + 12 – (120 +59 + 36)=
= 518 – 215 = 303
8. 2000 – 780 + 220 – 350 – 199 =
= 2000 + 220 – (780 + 350 + 199) =
= 2220 – 1329 = 891 9. 454 – 48 + 32 – 92 + 24 =
= 454 + 32 + 24 – (48 + 92) =
=510 – 140 = 370
10. 450 – 225 – 98 + 23 – 150 =
= 450 + 23 – (225 + 98 + 150) =
= 473 – 473 = 0
11. 567 – 234 + 78 – 93 + 56 + 23 =
= 567 + 78 + 56 + 23 – (234 + 93) =
= 724 – 327 = 397
12. 870 – 159 + 67 – 149 – 289 + 25 =
= 870 + 67 + 25 – (159 + 149 + 289) =
= 962 – 597 = 365
