unit 1 section 2.1

Unit 1 sec2.1

18 September 2015

22:19

Example 1 Using the BIDMAS Rules

A.    8-2+5-1=

B.    5+12 ÷4=8

C.  

D.  (5-3)×4

SOLUTION

A.   The addition and subtraction have the same precedence, so do them in order from left to right.

 8-2+5-1=10 6+5-1=11-1=10

B.   Do the division first then the addition

5+12÷4=5+3=8

c.    Work out the power first, then do the multiplication.

Do the calculation in brackets first then do the multiplication.

 (5-3)×4=2×4=8.

ACTIVITIY 2 Using BIDMAS rules

A. 9+7-2-4=10

B. 2×(7-4)=6

C. (3+5)×3=24

D.               (3+4)×(2+3)=35

E.

There are many terms that have specific meaning.

The important terms and their definition are also collected together

Activitity 3

A. 2×(5+3)=16

B. (3+4)×7=49

C. 1+(2×3)=7

D.               9-(3×2)=3

E. 2×(3+3)×5=60

Some terms for calculation.

1. The SUM of two numbers is a result of adding them together.

2. A difference between two numbers is a result of subtracting one from the other. There are two possible answers, depending on which way round you take the number, but usually the smaller number is subtracted from the larger.

3. The PRODUCT of two numbers is a the result of multiplying them.

4. A QUOTIENT of two numbers is the result of dividing one by the other. There are two possible answers, depending on which way round you take the numbers.

ACTIVITY 4

A. 4+8=12

4×8=32

B. 4-2=2

4/2=2