Doubles The doubles are 1 + 1, 2+ 2, 3 + 3, 4 + 4, 5 + 5, 6 + 6, 7 + 7, 8 + 8, and 9 + 9.Click to see full answer. Hereof, can you use doubles to help you find any of the sums?Use doubles facts to help you find sums. If you know 6 + 6, you can find 6 + 7. 7 is 1 more than 6. So 6 + 7 is 1 more than 6 + 6.Similarly, what are doubles facts? Double Facts are additions in which a number is added to itself. For example, 1 + 1, 2 + 2 etc. Internalizing double facts are helpful building blocks in developing fluency in adding single digit numbers. Double Facts within 20 Worksheet is about practicing double facts for numbers up to 10. Then, which doubles fact can help you solve 4 5 =? For example, 5 + 4 = 9 is near the doubles 4 + 4 = 8 and 5 + 5 = 10, so either double could be used to find the sum of 5 + 4. Everyday Mathematics 4 at Home Unit Resources Grade 1 Unit 6: Addition Fact Strategies Background Information Vocabulary List Do-Anytime Activities What is a doubles plus 1 fact?Doubles plus one An example of a doubles-plus-one fact is 8 + 9. The sum for this can be easily found by thinking of the fact as a double plus one: 8 + 8 + 1 = 17. Combinations to 10 Recognize numbers with sums of 10: 6 + 4, 4 + 6, 5 + 5, 3 + 7, 7 + 3, 8 + 2, 2 + 8, 9 + 1, and 1 + 9.