Oefen de erbijsom en erafsom tot 1.000
In de mix
|
1.
815 – 583 =
232
2
|
2.
252 + 255 =
507
2
|
3.
603 + 318 =
2
921
|
4.
34 – 31 =
3
1
|
|
5.
825 – 670 =
155
2
|
6.
811 + 161 =
2
972
|
7.
954 + 18 =
972
2
|
8.
912 – 15 =
2
897
|
|
9.
617 – 194 =
2
423
|
10.
444 + 460 =
904
2
|
11.
120 – 79 =
41
2
|
12.
769 – 254 =
515
2
|
|
13.
872 – 384 =
2
488
|
14.
11 + 389 =
2
400
|
15.
819 – 422 =
397
2
|
16.
583 – 234 =
349
2
|
|
17.
772 – 453 =
2
319
|
18.
4 – 4 =
0
2
|
19.
646 + 148 =
794
2
|
20.
87 – 83 =
4
1
|