Fundamentals of Economics. Доловова Н.Н - 57 стр.

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A square with sides that measure 10 cm. has an area of 100

sq. cm. The square of 7 (7

) is 49. The square of 9 is 81. A

table four foot square (a table with sides that are four feet) has

an area of sixteen square feet.

This circle has a diameter of two inches. Its radius is one

inch. To find the area of a circle we multiply the square of the

radius by π (the Greek letter p, pronounced pai). A=πr

The area of this circle is 1

x 3,14 square inches.

Answer these questions:

1. What is the answer if you add 17 to 71?

2. What remains if you subtract 15 from 75?

3. What is the answer if you multiply 9 by 12?

4. What are 8 times 8?

5. Are questions 3 and 4 problems in division or problems in multiplication?

6. What do 5, 6 and 7 add up to?

7. What is the answer if you divide 60 by 5?

8. If you divide 17 by 3, the answer will be 5 ... and how many left over?

9. The oblong ABCD has sides that are 6 cm, and 4 cm. What is the area of the

tria ng le ABD ?

10. Think of a number—any number you like. Add 6 to it. Multiply the new number

by 2 and then subtract 8 from the answer. Divide this answer by 2 and then subtract

the number you first thought of. If the answer is 2, mark it right. If it is not 2, mark it

wrong and do the question again.