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15 Math Terms

15 Math Terms. By. Bryan Doss. Decimals. When you Add or Subtract a decimal you line up the decimals. When you multiply decimals you count the places in the problem. Fractions to Decimals. To change a decimal to a percent you multiply by 100. Then move it two times to the right.

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15 Math Terms

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  1. 15 Math Terms By. Bryan Doss

  2. Decimals • When you Add or Subtract a decimal you line up the decimals. • When you multiply decimals you count the places in the problem.

  3. Fractions to Decimals • To change a decimal to a percent you multiply by 100. • Then move it two times to the right.

  4. Ordering Fractions • Divide to change a decimal(only two decimal places) • Put on number line.

  5. Scientific Notation • Positive Exponent: 3.2 x 10³= 3,200 move the decimal towards the positive end of the number line. (whole numbers) • Negative Exponent: 3.2 x 10³= 0.oo32 move decimal to negative side of the number line.

  6. Division of Integers • If the signs are the same the answer is positive. If the signs are different the answer in negative. Even number of negative-signs the answer is positive. Odd number of negative-signs the answer is negative.

  7. Multiply & Dividing one-step equations • Find the variables. • Do the opposite operation of the exact number with the variables. • Solve - follow integer rules.

  8. Percent Of a Number • To find a percent of a number you multiply the original number times the decimal for that percent. • Example: If you need to find 40% of 68, you would 68 x .4 Make sure you count your decimal places when you multiply.

  9. Scale Factor • When the shape is being increased or decreased in size, Each side is being multiplied by a scale factor. • If a scale factor is greater than 1 than the shapes gets bigger.

  10. Pythagorean Theorem • Looking for C use:a² + b² =c² • If you know C use:c²-a²=b² • You must have a right triangle A & B are the legs of a right triangle. • C is always across from the L (angle).

  11. Dimensional Change • Org. Perimeter time S.F.= new perimeter. • Org. Area times S.F.² = new area.

  12. Probability • Theoretical Probability- Is what should happen in a given event. • Independent Event- Is an event where the outcome of one event does not effect the outcome of others.

  13. Box & Whisker

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