Let's Learn Those Facts
In this unit, students who have previously studied the meanings of addition use the properties of addition to help them learn addition facts and to master the addition tables. The unit is most appropriate for students of grades 1 and 2. The ability to name the sum of two one-digit numbers with speed and accuracy is an important accomplishment. This skill allows students to focus on multistep algorithms and to compute the answers to problems. Addition properties explored in this unit include the order property, the additive identity, and the results of adding by zero. The most effective and efficient way to help students learn addition facts is to help them build an understanding of the operation, encourage them to use the helpful features of the number system, and give them interesting activities that foster retention.
This is a 5 day unit on properties of addition. Each lesson gives an interesting activity that helps students retain the addition facts.
- Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple of 10, using concrete...
- Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.
- Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 +...
- Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.
- Fluently add and subtract within 5.
- GLE 0206.2.1
- Understand and use place value concepts to 1000.
- GLE 0206.2.2
- Understand and use the base-ten numeration system.
- GLE 0206.2.3
- Use efficient and accurate strategies to develop fluency with multi-digit addition and subtraction.
- Add a two-digit number to a one-digit number and a two-digit number to a multiple of ten (within 100). Use concrete models, drawings, strategies based on...
- Understand subtraction as an unknown-addend problem. For example, to solve 10 - 8 = ___, a student can use 8 + ___ = 10.
- Fluently add and subtract within 20 using mental strategies. By the end of 1 st grade, know from memory all sums up to 10.
- Fluently add and subtract within 30 using mental strategies. By the end of 2nd grade, know from memory all sums of two one-digit numbers and related...
- Fluently add and subtract within 10 using mental strategies.
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- Generate the addition facts with sums of 5, 6, 7, and 8.
- Use a game to practice the addition facts with sums of 5, 6, 7, and 8.
NCTM Standards and Expectations:
- Understand the effects of adding and subtracting whole numbers.
- Develop and use strategies for whole-number computations, with a focus on addition and subtraction.
- Develop fluency with basic number combinations for addition and subtraction.
- Use a variety of methods and tools to compute, including objects, mental computation, estimation, paper and pencil, and calculators.
- What addends sum to 8? To 7? To 6? To 5?
- Look at the numbers that add to 7 on the table. Do you see any doubles? How about when you look at those that added to 8? To 6? Why is that?
- What happens when we add 0 to a number?
- Hundreds charts
- Addition charts
- Using Calculators and Hundred Boards Electronic Tool