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Addition Fact Strategies By the end of Grade Two, students are expected to recall basic addition facts with a response time of 3 seconds or less. Strategies aid children in their recall of facts. Listed below are the strategies we will work on this year. Counting On: Students start with the largest number in the equation and then count on. This strategy is only useful when you are adding 1,2 or 3 to a number. For example: 5+2 = Start with 5 and count on 6,7. Doubles: The goal is for students to be able to name, quickly and accurately, the double of any number from 1 to 9. The students have been using visual clues to think of when trying to remember these double facts. Double Fact: 4+4 5+5 6+6 7+7 8+8 9+9 Possible Association: Number of legs on a spider Number of fingers on 2 hands Number of eggs in a carton Number of days in 2 weeks Number of crayons in two rows of a box Number of tires on an 18-wheeler truck Doubles Plus 1 or 2: Once students can easily recall the sum of any double from 1 to 9, they can use those facts to help them mentally figure out combinations that are close to a double. For example: 3+4 = Think: Double 3 is 6 plus 1 more makes 7 5+7 = Think : Double 5 is 10 plus 2 more makes 12 Combinations that make 10: Students should practice having quick recall of the combinations that add to 10. 0 and 10 1 and 9 2 and 8 3 and 7 4 and 6 5 and 5 Once students know these addition combinations to make 10, they will find them useful in learning other facts. Example : 8 + 4 = Think 8 + 2 makes 10 + 2 more = 12 Adding with 10: When students are adding 10, the ones digit is staying the same and the tens digit is increasing by one. Example: 10 + 5 = 15 7 + 10 = 17 This strategy becomes very useful when we begin adding with larger numbers. ( Example : 35 + 10 = 45) Adding with 8 or 9: Once students understand how to add with 10, this strategy becomes easier to use. This works in 2 steps. First students think about what the addend plus 10 would be. Then they subtract either a 1 or 2 away from that sum (depending on whether they are adding 8 or 9). Example: 6 + 9 = Think: 6 + 10 = 16 so 6 + 9 is 1 less which = 15 6+8= Think : 6 + 10 = 16 so 6 + 8 is 2 less which = 14 OR - Another way to add with 8 or 9 is to take away 1 or 2 from the one addend to make the 9 or 8 addend a 10, and then adding this 10 to what was left from the other addend. Example : 9 +7 = Think: Take 1 from the 7 to make the 9 a 10, and then add 10 and 6 to get 16.