Grade 7/8 Math
(-30) - (-82) =
Answer: 52
Using only addition, add eight 8s to get the number 1,000.
888 + 88 + 8 + 8 + 8 = 1,000
Four sections of the coordinate plane.
Quadrants
What is 40% of 150
60
Suzi has 3 mangoes and 2 pears in one hand and 2 mangoes and 4 pears in the other. How many pears and mangoes did Suzi have?
Answer: 5 mangoes and 6 pears
Define a Mode:
Most frequent value in a set of numbers.
(-662) - 491=
Answer: -1,153
When I was 6, my sister was half my age. Now, I'm 70. How old is my sister?
**DOUBLE POINTS**
67 years old
A number which is combined (added) to another.
Addend
Solve 4+8÷2x3-1=
15
What is the smallest whole number that is equal to seven times the sum of its digits?
42. The sum of its digits is 4 + 2 = 6, and 7 x 6 = 42.
Way to write very large or small numbers using exponents
**DOUBLE POINTS**
Scientific Notation
(987)-(-403) =
Answer: -584
If you multiply 8 with any other number, the number will remain the same: What is the number we are talking about?
Answer: Zero
Equation with a straight-line graph
Linear Equation
18 ÷ 3 + 12 - 8 + (7 - 2)² × 2=
**DOUBLE POINTS**
60
You know 2 + 2 comes to the same as 2 x 2. Now find a set of three different whole numbers whose sum is equal to their total when multiplied.
**DOUBLE POINTS**
The three different whole numbers whose sum is equal to their total when multiplied are 1, 2 and 3.
Define Pythagorean Theorem:
Formula (a² + b² = c²) to find the length of the hypotenuse in a right triangle.
839+(-425) =
An Old Granny left half her money to her granddaughter and half that amount to her grandson. She left a sixth to her brother, and the remainder, $1,000, to the dogs’ home. How much did she leave altogether?
Adding one half, one quarter and one-sixth tells us that the total is a fraction of twelfths (2 + 4 + 6 = 12). You can also think about it as 6/12, 3/12, 2/12, which equals 11/12. If the remainder is $1,000, that must be one-twelfth, so the total is $12,000.
Define Slope:
Measure of a line's steepness, calculated as rise over run