Doubles + 1: This strategy is used when numbers are next to each other on the number line. The steps include: 1. Find the smaller number 2. Double the smaller number 3. Then add 1 Example: 5+4=4+4 then + 1= 4+4+1=9
Partners of 10: Knowing all the facts that equal 10 will make adding larger numbers easier because it’s easy to add to 10. Examples: 9+1=10, 8+2=10, 7+3=10, 6+4=10
Make a 10: Use this strategy to solve problems with larger addends (8+7= ) 8 + X X + X X X X X = 10 + 5 = 15 Mental Steps: 1. Think about "what +8 = 10? 2. Take the 2 and add it to 8 to make a 10 3. Since you gave the 2 to the 8 you need to take it away from the 7. Think 7 - 2 = 5 4. Finally add 10 + 5 = 15
Counting On: Use this strategy only when adding 1, 2, or 3 to a number. Steps (7+3= ): 1. Say the larger number. (Say 7) 2. Count up the smaller number. (8, 9, 10).
Commutative Property or Turn Around Facts: Use facts you know to solve commutative facts. Example: 5+3=8 so 3+5=8 Cick here to edit.