In this video, Daniel learns the concept of addition using addition sentences.

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

In this video, Jada learns to count, read and write the numbers 16 and 17 using groups of 10 and individual numbers.

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

In this video, Jackson learns the properties of basic three-dimensional geometric shapes by selecting the best shapes (cube, sphere, cylinder, cone) and arranging them appropriately to build a tower.

In this video, Emily uses an addition fact to solve a subtraction problem.

In this video, Marta learns to fill a 10-frame model to solve an addition problem.

In this video, Marta uses data collected in a T-chart to make a picture graph displaying her friends' favorite vegetables.

In this video, Marta uses 10-frames to count to 120 by tens.

In this video, Marta learns how to use 10-frames and counters to solve an addition problem.

In this video, Carlos uses addition facts and sentences to solve subtraction problems, and learns that addition facts and subtraction facts are related.

In this video, Emily uses cubes to determine whether a number is even or odd by comparing the ones digits.