Выполним вычисления:
1. $$875 - 496 = 379$$
2. $$563 + 289 = 852$$
3. $$602 + 398 = 1000$$
4. $$840 : 4 = 210$$
5. $$960 : 3 = 320$$
6. $$720 : 4 = 180$$
7. $$276 \cdot 2 = 552$$
8. $$148 \cdot 3 = 444$$
9. $$320 \cdot 3 = 960$$
10. $$48 : 6 \cdot 70 = 8 \cdot 70 = 560$$
11. $$32 : 4 \cdot 90 = 8 \cdot 90 = 720$$
12. $$28 : 7 \cdot 60 = 4 \cdot 60 = 240$$
Ответы:
$$875 - 496 = 379$$
$$563 + 289 = 852$$
$$602 + 398 = 1000$$
$$840 : 4 = 210$$
$$960 : 3 = 320$$
$$720 : 4 = 180$$
$$276 \cdot 2 = 552$$
$$148 \cdot 3 = 444$$
$$320 \cdot 3 = 960$$
$$48 : 6 \cdot 70 = 560$$
$$32 : 4 \cdot 90 = 720$$
$$28 : 7 \cdot 60 = 240$$