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Grade 5 Math: Comparing Whole Numbers : Math Made Easy
By Lumos Learning
Subscribe Now: http://www.youtube.com/subscription_c... Watch More: http://www.youtube.com/ehoweducation Comparing whole numbers involves working with anything valued at zero and above. Learn about comparing whole numbers in grade five math with help from a professional private tutor in this free video clip. Expert: Rachel Kaplove Filmmaker: Alexis Guerreros Series Description: Most mathematical concepts really aren't that difficult, but you have the have the proper instruction. Get tips on math with help from a professional private tutor in this free video series.
Work Word Problems | MathHelp.com
By MathHelp.com
To solve a polynomial inequality, like the one shown here, our first step is to write the corresponding equation. In other words, we simply change the inequality sign to an equals sign, and we have x^2 – 3 = 9 – x. Next, we solve the equation. Since we have a squared term, we first set the equation equal to 0. So we move the 9 – x to the left side by subtracting 9 and adding x to both sides of the equation. This gives us x^2 + x – 12 = 0. Next, we factor the left side as the product of two binomials. Since the factors of negative 12 that add to positive 1 are positive 4 and negative 3, we have x + 4 times x – 3 = 0. So either x + 4 = 0 or x – 3 = 0, and solving each equation from here, we have x = -4, and x = 3. Now, it’s important to understand that the solutions to the equation, -4 and 3, represent what are called the “critical values” of the inequality, and we plot these critical values on a number line. However, notice that our original inequality uses a greater than sign, rather than greater than or equal to sign, so we use open dots on our critical values of -4 and positive 3. Remember that ‘greater than’ or ‘less than’ means open dot, and ‘greater than or equal to’ or ‘less than or equal to’ means closed dot. Now, we can see that our critical values have divided the number line into three separate intervals: less than -4, between -4 and 3, and greater than 3. And here’s the important part. Our next step is to test a value from each of the intervals by plugging the value back into the original inequality to see if it gives us a true statement. So let’s first test a value from the “less than -4” interval, such as -5. If we plug a -5 back in for both x’s in the original inequality, we have -5 squared – 3 greater than 9 minus a -5, which simplifies to 25 – 3 greater than 9 + 5, or 22 greater than 14. Since 22 greater than 14 is a true statement, this means that all values in the interval we’re testing are solutions to inequality, so we shade the interval. Next, we test a value from the “between -4 and 3” interval, such as 0. If we plug a 0 back in for both x’s in the original inequality, we have 0 squared – 3 greater than 9 – 0, which simplifies to 0 – 3 greater than 9, or -3 greater than 9. Since -3 greater than 9 is a false statement, this means that all values in the interval we’re testing are not solutions to inequality, so we don’t shade the interval. Next, we test a value from the “greater than 3” interval, such as 4. If we plug a 4 back in for both x’s in the original inequality, we have 4 squared – 3 greater than 9 – 4, which simplifies to 16 – 3 greater than 5, or 13 greater than 5. Since 13 greater than 5 is a true statement, this means that all values in the interval we’re testing are solutions to inequality, so we shade the interval. Finally, we write the answer that’s shown on our graph in set notation. The set of all x’s such that x is less than -4 or x is greater than 3.
Rounding Whole Numbers - YourTeacher.com - Math Help
By yourteachermathhelp
In this video students learn to round a number to a given place using the following steps. First find the digit in the rounding place. Next look at the digit to the right of the rounding place. If the digit to the right of the rounding place is less than 5 round down which means that the digit in the rounding place stays the same and all digits to the right of the place become zero. If the digit to the right of the rounding place is 5 or greater round up which means add 1 to the digit in the rounding place and all digits to the right of the rounding place become zero.
Types Of Fractions - Review | Maths For Grade 5 | Periwinkle
By Lumos Learning
Types Of Fractions - Review | Maths For Grade 5 | Periwinkle
Dividing Mixed Numbers
By Davitily
The instructor uses an electronic chalkboard to demonstrate how to divide mixed numbers. One example is modeled using a step by step approach.
Dividing Mixed Numbers and Fractions
By Khan Academy
Here is another helpful video from the Khan Academy. In this video Sal Khan clearly explains how to divide fractions when whole or mixed numbers are involved.
How to Pass the Math FSA - Area (Addition and Multiplication) (3rd)
By McCarthyAcademy
how to solve 3rd Grade FSA Math-style problems.
