Say two-digit numbers using number words (79 is “seventy nine”). Use “tens” and “ones” to explain the meaning of a two-digit number (“79 is seven tens, and nine ones).

Your card number is carefully structured. The very first digit is what’s known as the major industry identifier. A 4 means ...

Decompose numbers to subtract. Engage in a Number Talk focused on subtraction strategies. Can you solve the problem without pencil and paper? Play a fun subtraction game called "Less than 10".