Oefen de erbijsom en erafsom tot 1.000
In de mix
|
1.
863 + 15 =
878
2
|
2.
135 – 78 =
57
2
|
3.
539 – 14 =
525
2
|
4.
245 + 501 =
2
746
|
|
5.
197 – 75 =
122
2
|
6.
795 – 533 =
2
262
|
7.
101 – 21 =
2
80
|
8.
638 + 247 =
2
885
|
|
9.
142 – 124 =
18
2
|
10.
14 + 269 =
2
283
|
11.
18 + 499 =
517
2
|
12.
289 + 119 =
2
408
|
|
13.
799 + 47 =
2
846
|
14.
448 – 447 =
1
2
|
15.
639 – 88 =
2
551
|
16.
834 – 437 =
2
397
|
|
17.
158 + 253 =
411
2
|
18.
40 – 29 =
11
1
|
19.
321 + 78 =
2
399
|
20.
337 – 251 =
2
86
|