Number talks
Number talks ask students to use mental math to solve addition, subtraction, and multiplication problems without using pencil and paper.
As an educator, you can use these videos and resources in many different ways:

Use the videos as a tutorial and use the slide decks to present the number talks yourself.

Share the videos during your whole group lesson as a daily routine.

Have students work through each video individually in centers.
Number Talk (2digit addition)
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Number Talk (2digit subtraction)
Number Talk (2 x 1 multiplication)
Number Talk (2 x 2 multiplication)