1 + 1 = 2. It starts here.
Combining single-digit numbers to find a sum.
The plus sign (+) was invented in 1489 by Johannes Widmann.
Count up from the larger number.
Plain English: This is the very first step in math. You have a pile of stuff, you get another pile, and you count how much you have in total.
Real-world example: You have $3. Mom gives you $5. How much money for candy do you have?
Don't count the number you start with! Start counting on the NEXT number.