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How to do the thinking questions on page 98 of the first volume of the fourth grade math book? (People's Education Edition)
First question

1023004 1023004

1023400 1023400

12340001234000

1020304 1020304

the second question

13X 1 1 = 13X( 10+ 1)= 130+ 13 = 143

12x 33 =( 10+2)x33 = 330+66 = 396

14x 55 = 14x5x 1 1 = 70x 1 1 = 770

15x 66 = 15x6x 1 1 = 90x 1 1 = 990

12 1x 1 1 = 12 10+ 12 1 = 1330

134 x 1 1 = 1340+ 134 = 1474

158 x 1 1 = 1580+ 158 = 1738

167 x 1 1 = 1670+ 167 = 1837

Third question

543x20 542x30 540x23 540x32

534x20 532x40 530x24 530x42

523x40 524x30 520x43 520x34

504 x23 504 x32 503 x24 503 x42 502 x34 502 x43

Then a truth at the beginning of 4 3 2 *** 72 kinds of 520x43 are the largest.

The fourth question is 203x16 = 3248 203x26 = 5278 203x36 = 7308 203x46 = 9338.

Question 5: Password 840242

The sixth question is 47x49=2303 1995 divided by 2 1=95.