שם:

השלם את הסדרות הבאות.

10, 20, ___, ___, ___, ___, ___, ___

20, 30, ___, ___, ___, ___, ___, ___,

40,50, ___, ___, ___, ___, ___

10, 20, ___, ___, ___, ___

10, ___, 30, ___, ___, ___, ___, ___

30, ___, 50, ___, ___, ___, ___

20, ___, 40, ___, ___, ___

40, ___, 60, ___, ___, ___,___