MATH PRACTICE

1. MATH PRACTICE

2. REARRANGING EQUATIONS • Example: • What is m? • What is v?

3. RE ARRANGING EQUATIONS

4. CALCULATING PERCENT EX: There are 350 girls and 150 boys in a school. Calculate the percent of boys in the school • Total number of students: 350+ 150 = 500 • % boys = number of boys x 100 total number of students = 150 x 100 = 30% 500 Thus, the % of boys is 30%

5. UNIT CONVERSIONS King Henry’s Daughter Must Drink Chocolate Milk!

6. UNIT CONVERSIONS • To convert from a LARGER to smaller metric unit you always Multiply  • To convert from a smaller to LARGER unit you always Divide

7. CONVENSIONS • Kilo km, kg, kl • Hecto hm, hg, hl • Deca/Deka dam, dag, dal • Metre, Gram, Litre m, g, l • Deci dm, dg, dl • Centi cm, cg, cl • Milli mm, mg, ml

8. UNIT CONVERSIONS • Ex: Convert the following: • A) 2 l to ml • 2000 ml • B) 2 kg to g • 2000 g • C) 30 cm to km • 0.0003 km • D) 12 hm to cm • 120000 cm

9. SCIENTIFIC NOTATION • a shorter method to express very large numbers. • Scientific Notation is based on powers of the base number 10 • The number 123,000,000,000 in scientific notation is written as

10. Exponent • The first number is called the coefficient (1.23) • It must be greater than or equal to 1 and less than 10. • The second number is called the base . It must always be 10 in scientific notation.  Coefficient Base

11. TO WRITE A NUMBER IN SCIENTIFIC NOTATION • Ex: Put 123,000,000,000 in SN • Put the decimal in between the first two NON-Zero numbers • The coefficient is 1.23

12. TO WRITE A NUMBER IN SCIENTIFIC NOTATION cont…d • To find the exponent count the number of places that the decimal has moved. • If the decimal moves to the right, the exponent is negative • If the decimal moves to the left, the exponent is positive

13. TO WRITE A NUMBER IN SCIENTIFIC NOTATION cont…d • In 1 2 3 0 0 0 0 0 0 0 0 0there are 11 places. • Therefore we write 123,000,000,000 as:

14. HOMEWORK • Math Practice Sheet 