In this video, Marta learns how to write a subtraction number sentence, and how to use the minus sign.

In this video, Emily learns how to count, write and compare numbers to determine which one is less than the other.

In this video, Carlos learns how to count and write a large number of objects by arranging them into groups of tens and ones.

Students will learn to solve problems involving scale drawings of objects. Then they will be able to correctly write the new scale proportions.

Use this video to determine how to write a rate and unit rate for a given quantity, and use ratio reasoning to solve problems.

Laura Amy Schlitz, author of A Drowned Maiden's Hair: A Melodrama , discusses her writing process in this video (1:00).

Candlewick Press children's author N Griffin answers 5 questions (plus one!) about the writing process, being creative, and the perfect readers for the Smashie McPerter books. (3:37)