4.Mathematic Forms 数学式

(1) Addition 加法

1+2=3 One and two are three.

2+3=5 Two plus three equals five.

4+0=4 Four and nought is equal to four.

45+70+152=267 45,70 and 152 added are (or make) 267

the sum (or total) is 267.

演算时的读法： Three and seven are ten; I write(or I write down,or I put down)a nought

and carry one. Four and one that I carry are five, and eight make thirteen,and three

sixteen; I write down six and carry one. One and one (that I carry) are two; I put down

two.- The sum (or total, or the result of the addition) is two hundred and sixty. 37,80

and 143 added together, and(or make) 260.

(2)Subtraction 减法

9-4=5 Nine minus four equals (or is equal to) five.

15-7=8 Seven from fifteen leaves eight.

23,654-8,175=15,479 8,175 (take or subtracted) from 23,654 leaves 15,479. The difference

(or The remainder) is 15,479.

Nine from five won`t go.

演算时的读法：Nought from nought (leaves) nought. One from one leaves nought (or nothing).

Two from three (leaves) one. I can`t take (or subtract) five from four; I must borrow ten;

five from fourteen leaves nine.- The difference (or The remainder) is nine thousand one

hundred. 5210 (take or substracted) from 14,310 leaves 9,100.

(3)Multiplication 乘法

1×0=0 One multiplied by nought equals nought.

1×1=1 Once one is one.

2×1=2 Twice one is two.

3×5=15 Three times five is fifteen

6×0=0 Multiply six by nothing, and the result is nothing.

演算时的读法: Five times nine (or Nine multiplied by five) are forty-five; I put down five

and carry four. Five times seven are thirty-five and four (that I carry) are thirty-nine; I write

down nine and carry three. Five times six make thirty and three (that I carry) thirty-three; I put

down thirty-three.

Eight times nine (or Eight nine) are seven two; I write two and carry seven. Eight sevens make

fifty-six and seven are sixty-three. I put down three and carry six. Eight sixes make forty-eight

and six fifty-four; I write down fifty-four.

I now add the partial results (or products) Five. Two and nine are eleven. Three and three are

six and one are seven. Four and three make seven. Five.

(4)Division 除法

9÷3=3 Nine divided by three maks (or is equal to) three.

20÷5=4 Five into twenty goes four times.

4567÷23=198余13 23 into 4567 goes 198 times, and 13 remainder.

The quctient is 198, and 13 remainder.

演算时的读法: Fifteen into thirteen won`t go ; fifteen into one hundred and thirty-eight goes nine

times; nine times fifteen are one hundred and threty-five; one hundred and thirty-five from one hundred

and thirty-eight leaves three; I bring down seven; fifteen into thirty-seven goes twice; twice fifteen

are thirty; thirty from thirty-seven leaves seven.

        The (exact) quotient is ninety-two, and seven remainder; 15 into 1387 goes 92 times, and 7 remainder.