1 Numbers, Mat. operations - exercises

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NUMBERS Match the numbers in column A to the way in which we say them – in B

I. A

1. 3.623 2. 3,623 3. 152 4. 5. 6. 7. 8. 9. 10. 11. 12.

0.3 8.03 25% 733,051 25°C or F 733051 (phone number) 1

B a. b. c. d. e. f. g. h. i. j. k.

a (one) hundred and fifty two seven double three oh (zero – AmE) five one twenty five per cent three thousand six hundred and twenty three eight point oh three two thirds; two over three seven hundred and thirty three thousand, and fifty one one and three quarters; one and three fourths a half; one half three point six two three nought point three; zero point three (AmE) l. twenty five degrees centigrade (celsius) or fahrenheit

Look at this: 152

II.

3,623

are whole numbers

0.3

are fractions

0.3

is a decimal (fraction)

Find mistakes in the following:

1. 379 = three hundreds seventy nine 2. 3. 4. 5. 6. 7. 8.

III.

= two threes 1997 (date) = one thousand nine hundred and ninety seven 2.85 = two point eighty five 4,000,000 = four billion 655 2803 (phone number) = double six five, twenty eight oh three hundreds people (setki ludzi) thousand of mosquitos (tysiące komarów)

Look at this:

4 is a positive number -4 is a negative number An even number can be divided exactly by the number two e.g. 2, 4, 14 An odd number cannot be divided exactly by the number two e.g. 3, 9, 17 Are these numbers positive/negative, even /odd? 1. the number of students in class today 2. the temperature today 3. the number of flowers we usually put in a bouquet 4. the altitude of the Dead Sea 5. the number of people in your immediate family

IV. 1. 2. 3. 4. 5. 6. 7.

In the sentences below circle the correct answer. 4 is a decimal/ positive/ prime number. 9 is not a(n) odd/ prime/ positive number. 0.05 is a decimal fraction/ friction/ faction. – 11 is a(n) positive/ even/ negative number. In English the number „5.1” is said: five comma/ point/ over one. 1,000 is a haul/hole/whole number. 1/3 is an example of a whole number/ decimal fraction/ vulgar fraction.

MATHEMATICAL SYMBOLS AND OPERATIONS I.

There are four basic processes of arithmetic: addition, subtraction, multiplication and division. Complete the table below using these names, and the list of items below the table. The first question about addition has been completed for you.

symbols

operation how to read this

a+b=c

a plus /and b is/are/ equals/is equal to c

c–b=a

c minus b / b from c

sign name addition

symbol +

the result of the process name plus

sum

is/equals/leaves a axb=d a∙b=d d:b=a

a times b / a multiplied by b / is/ are/equals d d divided by b / the ratio of d to b is/ equals a

multiplication sign, quotient, – , product, ÷ , difference, sign of division, x , minus

II.

What are the verbs the four names of basic processes come from? 1. 2. 3. 4.

addition subtraction multiplication division

-

to add _______________________ _______________________ _______________________

III.

Here are some more symbols in A. Match them to the items in B (how to read them). A

B 1. 2. 3. 4. 5. 6. 7. 8. 9.

= a a a a a a x x

a. b. c. d. e. f. g. h. i.

=b ≠ b >b