Simple method of 35 × 35 + 65 × 35
35×35+65×35
=(35+65)×35
=100×35
=3500
123+123+159+4567+49867+487498x948748x2485=?
Who can help me solve the problem of "comparing the scores of 123 / 456 and 1234 / 4567",
Or with a calculator, I haven't thought of any clever method at present