4.Mathematic Forms 数学式
Addition 加法
1+2=3 One and two are three.
2+3=5 Two plus three equals five.
4+0=4 Four and nought1 is equal to four.
45+70+152=267 45,70 and 152 added are 267
the sum is 267.
演算时的读法： Three and seven are ten; I writea 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 are two; I put down
two.- The sum is two hundred and sixty. 37,80
and 143 added together, and 260.
Subtraction 减法
9-4=5 Nine minus four equals five.
15-7=8 Seven from fifteen leaves eight.
23,654-8,175=15,479 8,175 from 23,654 leaves 15,479. The difference
is 15,479.
Nine from five won`t go.
演算时的读法：Nought from nought nought. One from one leaves nought .
Two from three one. I can`t take five from four; I must borrow ten;
five from fourteen leaves nine.- The difference is nine thousand one
hundred. 5210 from 14,310 leaves 9,100.
Multiplication 乘法
10=0 One multiplied by nought equals nought.
11=1 once one is one.
21=2 Twice one is two.
35=15 Three times five is fifteen
60=0 Multiply six by nothing, and the result is nothing.
演算时的读法: Five times nine are forty-five; I put down five
and carry four. Five times seven are thirty-five and four are thirty-nine; I write
down nine and carry three. Five times six make thirty and three thirty-three; I put
down thirty-three.
Eight times 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 Five. Two and nine are eleven. Three and three are
six and one are seven. Four and three make seven. Five.
Division 除法
93=3 Nine pided by three maks three.
205=4 Five into twenty goes four times.
456723=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 quotient is ninety-two, and seven remainder; 15 into 1387 goes 92 times, and 7 remainder.
