Review unit grade 9

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Review unit grade 9

  1. 1. Review unit grade 9<br />
  2. 2. Integers +5 -9<br />Add ……<br />Same sign<br />add the numbers, use the sign<br />-3 + -7 = -10<br />Different signs<br />subtract the numbers, use the sign of the higher number<br />3 + -7 = -4 <br />
  3. 3. Integers +5 -9<br />Subtract……<br />Change to add<br />-3 - -7 = -3 + 7 = 4<br />
  4. 4. Integers -5 +9<br />Multiply or divide…….<br />2 numbers <br />+ - = -<br /><ul><li>- = +</li></ul>+ + = +<br />More than 2 numbers<br />Even number of - = +<br />Odd number of - = -<br />
  5. 5. Fractions<br />Add or subtract…<br />Common denominator<br /><ul><li>+  =  +  = </li></ul>Multiply….<br />Multiply across<br />• = <br />Divide<br />Invert and multiply<br />÷ = • = <br />
  6. 6. Bedmas<br />Pay close attention to order of operations<br />brackets, exponents ,div and mult, add and subtract<br /> { 3 – 5 }2 ÷ 2 – 7 • 2<br /> {-2}2÷ 2 – 7 • 2<br /> 4 ÷ 2 – 7 • 2 <br /> 2 - 14<br /> -12<br />
  7. 7. Square Roots √5<br />2 of the same number multiplied to get what’s under the square root sign<br />√ 144 = 12<br />Because 12 • 12 = 144<br />
  8. 8. Geometry<br />Finding angle measures<br />Angle measure of a straight line = 180°<br />Opposite angles are =<br />148<br />32<br />32<br />

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