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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. |
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发表于 2016-7-9 23:54:17