Common and Decimal Fractions

Multiplication and Division

Addition and Subtraction

Основной курс

Essential Course

a) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate the Russian words back into English.

addition	fe'dijn]	сложение
subtraction	[sab'traekjn]	вычитание
plus	[plAs]	плюс
minus	['mamas]	минус
to add	[aed]	складывать, прибавлять
to subtract	[sab'traekt]	вычитать
to equal	['i:kw3l]	равняться, быть равным
to be equal

5 + 7 = 12 - five plus seven equals twelve

66 + 13 = 79 - sixty-six plus thirteen is equal to seventy-nine

a + b = с - a plus b is equal to с

15-6 = 9- fifteen minus six equals nine

81 - 33 = 48 - eighty-one minus thirty-three is equal to forty-eight

с - b = a - с minus b equals a

2. Solve these problems and read them:

99 + 77 =	8-3 =	315 + 145 =
61-50 =	47-18 =	859 - 600 =
114 + 316 =	1,203+419 =	4,444 + 7,777 =
b + d =	d-c =	a-b =

Pair work. Think of six problems of your own. Put them down. Ask your groupmate to solve them.

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a) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate the Russian words back into English.

multiplication to multiply multiplied by once twice three times four times division to divide divided by

[.rrultipli'keij'n] ['nultiplai] [wAns] [twais]

умножение умножать умноженное на один раз

[drvi3n] [diVaid]

дважды, два раза три раза четыре раза деление делить деленное на

1. a) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate the Russian words back into English.

дроби десятичные дроби простые дроби числитель знаменатель нуль нуль нуль точка

fractions decimal fractions common fractions numerator denominator nought zero point

['fraekjanz]

[.desimal 'fraekjanz]

[.кэтзп 'fraekjanz]

I'njuxnareita]

[di'nommeita]

[no:t]

I'ziarou]

[ou]

[point]

1x1 = 1- once one is one 2x2 = 4- twice two is four 3x3 = 9- three times three equals nine 4x4= 16 - four times four is equal to sixteen 12 x 10 = 120 - twelve multiplied by ten (by) is equal to one hun­dred and twenty a • b = ab

35:7 = 5- thirty-five divided by seven equals five 1000: 25 = 40 - one thousand divided by twenty-five is equal to forty d:b = c

2. Solve these problems and read them:

10x7 =	49:7 =	13x3 =	749: 7 =
100 x 100 = 234 x 6 = b • с =	175:25 = 12 x 12 = n: m =	618:6 = 33: 33 = l-k =	3,550x5 = 10,660: 10 = 1x1 =

3. Pair work. Think of five problems of your own. Put them down. Ask your groupmate to solve them.

(see page 98)

[ 0 point seven

nought point seven I zero point seven

0.7

----- one half (a half)

- - one third (a third)

— two sevenths 3----- three and a half 5----- five and a seventh 6----- six and five sevenths

0.002 - zero point two zeros two

1.1- one point one

5.36 - five point three six

65.57 - sixty-five point five seven

2. Read these common and decimal fractions:

15 8/9 0.0003

1/3 0.23

2/5 5/8 7 1/2 9 5/8

79.31

10.01

0.009

205.35

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3. Solve the following problems using the formulas of Ohm's Law. Model: - Current equals 5 amp; resistance equals 10 ohms. How much is the voltage? - Voltage equals current times resistance. 5 x 10 = 50 V

4. Pair work. Make up similar problems of your own. Ask your group-mate to solve them.

1. a) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate the Russian words back into English.

current resistance voltage to suppose law

['kArant] [n'ziSt9ns] [Voultid3] [sa'pouz] Ы

Ohm's Law

электрический ток сопротивление вольтаж, напряжение предполагать закон

1) R = 80 ohms

V = 55V
I =?

4) 1= 10,500 amp

V = 2,000 V
R =?

2) R= 10.25 ohms I - 35 amp V =?

5) V = 20.05 V R = 0.015 ohm I =?

3)V = 50.05 V I = 120 amp R =?

6) I = 0.24 amp R= 1.36 ohms V =?

V

R = - Resistance equals voltage divided by current.

V I = — Current equals voltage divided by resistance. R

V = IR Voltage equals current times resistance.

1. a) Cover the right column and read the English words. Translate them into Russian and check your translation.

b) Cover the left column and translate the Russian words back into English.

2. Translate into Russian: 1. An open and a short are troubles in a circuit. 2. A trouble in a circuit results in no current in it.

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