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Maths....Form1.....2題
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Maths....Form1.....2題1.Try to use the following methods of estimation to round the mumbers in the expression 235*52 correct to the nearest ten. Then find the estimated value of the expression.(i)Round off(ii)Round up(iii)Round down David wants to fill 52 cups with soft drink and each cup holds 235... 顯示更多 Maths....Form1.....2題 1.Try to use the following methods of estimation to round the mumbers in the expression 235*52 correct to the nearest ten. Then find the estimated value of the expression.(i)Round off(ii)Round up(iii)Round down David wants to fill 52 cups with soft drink and each cup holds 235 ml of lipuid. Pick one of the methods of estimation mentioned in (a) above to find out how many 1L bottled soft drink should be bought to fill all the cups. 2.On Monday, John invited two friends to join a party on the coming Sunday. On Tuesday, each of these 2 friends invited 2 other friends. On Wednesday, each of these 4 friends invited another 2 friends. The invitations went on like this. How many people were invited to the party until Saturday? 請用英文回答**不過用中文解釋**因為我好笨**所以請解釋得簡單D**真係十萬個唔該晒﹗﹗
最佳解答:
1.compatible numbers(相容數字法) 235*52 =240*50 =12000 (i)round off:(4捨5入) 235*52 =230*50 =11500 (ii)round up:(上捨入)將個數變大至十位(變幾多個位,要睇題目要求) 235*52 =240*60 =14400 (iii)round down:(下捨入)將個數變小至十位(變幾多個位,要睇題目要求) 235*52 =230*50 =11500 / =除 translation(轉移數字法)把個數轉移,比如28*6除7,就轉移至28除7*6就易計d translation 235*52/1000 =235/1000*52 =0.235*52 =12.22 =12L 2. 2*2+2*4+2*6+2*8+2*10+2*12 =4+8+12+16+20+24 =84 So there were84people invited to the party until Saturday 星期一,有2個朋友去john屋企,不過係星期日所以唔計 星期二,以上果2個朋友各介紹2個fd,一個介紹2個,所以2個介紹4個 如此類推. . . . .
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