The following is a reference:
Einstein is a world-famous scientist. At his request, a friend worked out a math problem: 2976× 2924 =? Einstein observed these two factors and immediately said that the number was 870 1824. His friend was very surprised. Einstein explained, "These two factors have their own characteristics and are not difficult to calculate." Students, please think about what kind of person Einstein is.
How's it going? It's quite difficult! Then let me tell you the secret.
You see, the characteristics of the two factors, 2976 and 2924, are that after they are separated from the middle, the left side is 29, and the right side is 76 and 24, which add up to 100, that is, the so-called "head and tail are the same, both are ten (hundred)". This kind of problem can be calculated by a simple method, that is, "headcount plus 1 is closely related to headcount multiplication." Therefore,
Solution: (29+ 1) × 29 76× 24
=30×29 =(50+26)×(50-26)
=870
=50×50-26×26
=2500-676
= 1824
Therefore, 2976× 2924 = 870 1824.