2. Write the missing number. 1) one, two, ___, four. 2) one, four, ___, ten. 3) ___, eight, six, four. 4) one, ___, six, eight.

1. one, two, three, four.
2. one, four, seven, ten.
3. ten, eight, six, four.
4. one, four, six, eight.

Ответ: 1) three; 2) seven; 3) ten; 4) four.