A Complete these sentences according to the clues in bracket

A Complete these sentences according to the clues in brackets.
1.___In____ ___the_____ ______past___,people counted numbers in tens.《在古代》
2.Can you write these numbers __in ____ _____different__ ___ways____?
3.The picture _____stands____ _______for____a modern calculator.《代表》
4.A computure can do a calculation _____in__ ____a____ ____flash____.非常快
5.It is an abacus.改为复数句子
____They______ _____are_____ ______ abaci_____
6.The little girl knows two languages.划线的句子提问
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____How______ ___many______ languages ____can______ the little girl ______speak_____?
7.My phone number is 25865281.对划线句子进行提问
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___What's____________your phone number?
8.Use your own computer.改为否定句
____Dont't___ ___use____ your own computer.
9.A computer can do a calculayion in a flash.改为一般疑问句
_____Can____ a computer _____do___a clculation in a flash?
10.The abacus in the picture shows a number.对划线部分提问
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____Which____ ____abacus_____shows a number?
11 David is from Thailand.改为同义句
David___comes___ __from______ Thailand.
12 The beads on the wires show ones,tens,hundreds and thousands.改为同义句
The beads on the wires___stands____ ____for___ ones,tens,hundreds and thousands.
13 This was a very important invention.改为感叹句
____What__an_important invention it was!
Rewrite these sentences with the help of the words in brackets.
1.multiply 4 by 5,and you will get 20.
4 times 5 is 20.
2.Add 3 and 9,and you’ll get 12.
3 plus 9 equals to 12.
3.Subtrct 2 from 10,and you’ll get 8.
10 minus 2 is 8
4.Divde 8 by 4 ,and you’ll get 2.
8 divided by 4 is 2.
5.Keep quiet,please.
Don't make noises ,please.