THE ORDER OF OPERATIONS AND PARENTHESES.


1. Write the expression and calculate!

a) Divide the sum of 5 and 13 with interval of 8 and 2 ;

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b) add to the quotient of numbers 30 and 6 the product of numbers 2 and 12;

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c) Multiply the quotient of numbers 45 and 9 with sum of numbers 2 and 3.

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2. But the parentheses.

2 + 4 · 2 = 12

50 : 5 + 5 - 1 = 9

8 + 2 + 3 · 2 - 1 = 17

32 + 1 : 1 + 2 = 11

 3. Find the letters.

a + b = 100
b - c = 10
c + d = 12
d = 5