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".

Specifically, note the first digit of this number. For example, if you have 400 friends, the leading digit is 4, and if you have 79, it's 7. Let's say we asked many people to do this.