MAFS.K.OA.1.5: Fluently add and subtract within 5.
Cognitive Complexity Level: 1-Recall
[divider] [/divider] Students are able to…
- Add one/Subtract one to numbers within 5 through concrete models, drawings and equations
- Add zero/Subtract zero to numbers within 5 through concrete models, drawings and equations
- Recognize that adding or subtracting 0 to numbers within 5 does not change the quantity
- Understand that adding one more to a number results in the next number in the counting sequence
- Understand that when you add or subtract by 0, it doesn’t change the quantity
[divider] [/divider] Students are able to…because teachers:
- Connecting “one more/one less” to the concept of adding 1/subtracting 1 to a number
- Have students count on and then describe what patterns occur when adding one more or subtracting one less
- Encourage the use of models, drawings and equations when adding or subtracting
- Pose “one more/one less/zero more/zero less” problems
- Facilitate discussions about what happens to a number when adding or subtracting by zero
[divider] [/divider] Questions to ask students:
- Ask: What happens to the number when you add or subtract by zero?
- Sample answer that indicates understanding: The number doesn’t change, it stays the same.
- Ask: What happens to the number when you add one more?
- Sample answer that indicates understanding: The number is one greater than the original number. It’s like counting on by one.
[divider] [/divider] Additional Resources:
- Khan Academy: Basic Addition
- Khan Academy: Add Within 5 Practice
- Khan Academy: Basic Subtraction
- Khan Academy: Subtract Within 5 Practice
[divider] [/divider] Sample Formative Assessment Tasks:
- Pose the following problems and ask what they notice: 0+1, 1+1, 2+1, 3+1, 4+1. They should notice the sum is one more than the original number. Continue with adding on zero, subtracting one and subtracting zero.
[divider] [/divider] Resources/Tasks to Support Your Child at Home:
- Using cereal have your child model…
- Adding and subtracting cereal within 5
- Adding one more by adding another piece of cereal to the bowl
- Subtracting one less by eating a piece of cereal
- Adding zero more and discussing what they notice
- Subtracting zero less and discussing what they notice
- Discuss what your child notices with the number patterns when they add/subtract by counting forward or backwards.