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Solving Proportions

The Distributive Property In Arithmetic

Grade 2 Math 9.5, Understanding place value (three-digits)

How each digit in a three-digit number has a different value as hundreds, tens, or ones. Expanded form of a three-digit number. Identifying the value of a digit in a three-digit number. Counting by hundreds, then writing the missing number by using a pattern. Writing a number represented by models of hundreds, tens, and ones

MathCraft: Place Value Divsion Common Core 4 NBT A1

By James Pike

Recognize that in a multi-digit whole number, a digit in one place represents ten times what it represents in the place to its right

Understanding angle addition formulas

By Khan Academy

Sal proves the identity cos(x+y) = cos(x)*cos(y) - sin(x)*sin(y).

Understanding angle addition formulas

By Khan Academy

Sal proves the identity sin(x+y) = sin(x)*cos(y) + cos(x)*sin(y).

Grade 5 Math - Place Value

By Lumos Learning

Using the Lumos Study Programs, parents and educators can reinforce the classroom learning experience for children and help them succeed at school and on the standardized tests. Lumos books, dvd, eLearning and tutoring are used by leading schools, libraries and thousands of parents to supplement classroom learning and improve student achievement in the standardized tests.