Addition and Subtraction Strategies

We started the year with addition and subtraction review. We have been working on strategies and tricks to help us add and subtract more efficiently. We came up with the following strategies:

addition strategies

• adding zero: the number stays the same
• adding one: the number is the next one up (one larger)
• doubles: the answer is an even number
• doubles plus one: the answer is one more than the doubles fact
• turnaround facts: turn the numbers around and the answer is the same

subtraction strategies

• subtracting zero: the number stays the same
• subtracting one: the number is the next one down (one less)