Numerical Fluency Addition and Subtraction Facts 2.0 Flashcards
Addition and subtractions fact fluency issues most commonly present themselves when students are solving addition facts with sums over _____ or subtraction facts with minuends over _______.
10
What are the 3 methods for solving addition facts with sums over 10?
- Doubles + or - 1
- Up to & Over 10
- Add 9, + 10 -1
Doubles + or -1 is an example of what kind of method?
Addition Facts with Sums over 10
Up to & Over 10 is an example of a method used for solving…
Addition Facts with Sums over 10
Add 9: +10, -1 is a method used for solving…
Addition Facts with Sums over 10
What is the following method that is used for solving Addition Facts with Sums over 10?
6 + 6 is 12, so 6 + 7 is 13.
Doubles + or - 1
What is the following method that is used for solving Addition Facts with Sums over 10?
9 + 9 = 18, so 9 + 8 = 17
Doubles + or - 1
What is the following method that is used for solving Addition Facts with Sums over 10?
8 + 5 =
(5 = 2 + 3, add 2 to 8 to make 10, add 3 to 10 to make 13.)
Up to & Over 10
What is the following method that is used for solving Addition Facts with Sums over 10?
7 + 10 is 17, so 7 + 9 is 16.
Add 9: +10, -1
What method is used to teach students Subtraction Facts and Missing Addends with minuends over 10?
Up to & Over 10
What is the following method that is also used for Subtraction Facts (and Missing Addends) with minuends over 10?
17 - 9 =
(Take 9 to 10 by adding 1. 9 + 1.)
(Find 10 to 17. That is 7. Now 7 + 1 = 8)
Thus 17 - 9 = 8
Up to & Over 10
In order for students to be in possession to learn techniques to master addition facts with sums over 10 and subtraction facts with menu over 10 they need to have mastery of the following prerequisite skills:
- Doubles Facts
- Complements of Ten
- Decomposing Single Digit Numbers
- 10 Plus a Single-Digit Number
- Addition Facts: Sums up to 10
