91Ó°ÊÓ

One useful addition strategy is known as "Near Doubles." It leverages the idea of using numbers that are close to each other to simplify the calculation.

For instance, when faced with the problem 8 + 9, you can notice that these numbers are nearly the same. You can think of 9 as one more than 8. Since many students already know their doubles (like 8 + 8 = 16), they can quickly calculate that by adding 1 more, 8 + 9 becomes 16 + 1. This gives the final result of 17.

This method is efficient because it uses a simple math fact you already know and just requires one additional step.

• Identify the two numbers: 8 and 9 are close together.
• Use the known double: 8 + 8 = 16.
• Add the extra 1: 16 + 1 = 17.

This strategy makes mental calculations faster and reinforces the importance of recognizing patterns in numbers.

"Making Ten" is another addition strategy that can simplify calculations by creating a round number that is easier to add from.

Consider the addition problem 8 + 9. The idea is to break apart the number 9 to make a 10 with 8.

You start by taking 2 from 9 to add it to 8, which makes 10. Then, what is left from 9 is 7, so you add that to 10 to reach 17.

• Break the number 9 into 2 and 7.
• Add 2 to 8: 8 + 2 = 10.
• Add the remaining 7: 10 + 7 = 17.

This is beneficial because many students can add to ten automatically without much effort, and working with tens makes further additions straightforward.

The "Counting On Strategy" is a straightforward and intuitive strategy for students who are just beginning to add numbers easily. It involves starting from one of the numbers and counting forward.

When adding 8 + 9, you start with the larger number, which is 9, and count up by the smaller amount, 8.

You can count aloud or in your head: starting at 9, go 10, 11, 12, 13, 14, 15, 16, and finally reach 17.

• Begin with the larger number: 9.
• Count on the next number, which is 8 more times.
• Reach the total: 17.

This approach not only helps solidify counting skills but is also a practical method when dealing with numbers in everyday situations.