Virginia Math Standard: 2.CE.1
The student will recall with automaticity addition and subtraction facts within 20 and estimate, represent, solve, and justify solutions to single-step and multistep problems, including those in context, using addition and subtraction with whole numbers where addends or minuends do not exceed 100.
How Many Ways: Add to 50
Fill in the blanks so two numbers add to exactly 50, using each digit only once. Then find the sneaky ways that start with a zero.
Broken Calculator: 2-Digit Addition
This calculator adds two-digit numbers wrong, the same way every time. Crack the rule, then predict its next mistake.
Game: Number Scrabble
What if we played Tic-Tac-Toe with numbers and instead of three-in-a-row, we add up to 15? Well… then we’d have Number Scrabble!
The Game of 100
Who can get to 100 first in this simple, but delightful, math game?