This Power Point includes 18 slides for 18 days of math warm ups. This is what I use at the beginning of 3rd grade to review place value and number sense. There are 5 slides of "Mystery Number" where students use clues to figure out a 3 digit to 6 digit number. There are 5 slides of 4 square model where there is a number in the middle, then they have to show a way to model that number in an addition sentence, subtraction sentence, in base 10 blocks, then with money. There are then 8 slides of mixed review. These slides cover rounding to the nearest ten and hundred, estimating sum and difference, number patterns, and ordering numbers (6 digit). Can be edited to use in lower or higher grades.