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The sixth grade mathematics experimental class of Jiangsu education printing plate, page 62, the second of the fourth question.
Is it to find the area of the shaded part? If so, the practice is as follows:
① 5× 5 = 25 4× 4 =1625+16 = 41(this step is to find the total area first).
② 5× 5 ÷ 2 =12.5 (5+4 )× 4 ÷ 2 =1812.5+18 = 30.5 (this step is to find the area of the blank part).
③ 41-30.5 =11.5 (the total area minus the blank area is the shadow area).