Doubles minus 1 is a strategy used to add two consecutive numbers that is, when they are next to each other. We simply add the bigger number twice or double it and then, subtract 1 from it, to get the final result. Here, for example, consecutive number 7 and 8 have been added using the doubles minus one strategy.
What is a double fact?
Review with your children that a doubles fact is a number sentence that repeats the same addend, such as 3 + 3 = 6 or 8 + 8 = 16. Using manipulatives or other classroom materials, give students opportunities to practice combining groups with the same number.
How do you add double by 7 8?
https://www.youtube.com/watch?v=9TsO04MTnBM
How do you teach doubles minus one?
https://www.youtube.com/watch?v=YD1VqzDTq6c
What is a doubles problem in math?
A double is a number arrangement where the same number is added twice. To use doubling in math, you add the same number to itself. For example, the double of 5 is 10 because 5 + 5 = 10. 5.9 Dec 2020