651 + 126; 306 - 138; 453 * 2; 5 * 171; 379 - 253; 402 - 243; 321 * 3; 6 * 98

Решение:

• $$651 + 126 = 777$$
• $$306 - 138 = 168$$
• $$453 \cdot 2 = 906$$
• $$5 \cdot 171 = 855$$
• $$379 - 253 = 126$$
• $$402 - 243 = 159$$
• $$321 \cdot 3 = 963$$
• $$6 \cdot 98 = 588$$