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- Adding and Subtracting Numbers

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Get Started Now- Intro Lesson: a4:58
- Intro Lesson: b6:22
- Intro Lesson: c5:32
- Intro Lesson: d2:22
- Intro Lesson: e3:17
- Lesson: 1a1:32
- Lesson: 1b1:34
- Lesson: 1c1:32
- Lesson: 2a1:37
- Lesson: 2b1:27
- Lesson: 2c1:58
- Lesson: 3a1:08
- Lesson: 3b1:23
- Lesson: 3c1:40
- Lesson: 4a2:45
- Lesson: 4b2:44
- Lesson: 4c3:15
- Lesson: 5a3:08
- Lesson: 5b3:09
- Lesson: 5c3:10
- Lesson: 6a3:52
- Lesson: 6b3:29
- Lesson: 6c2:40
- Lesson: 7a1:33
- Lesson: 7b2:22
- Lesson: 7c3:37

In this lesson, we will learn:

- The addition strategies of: (1) using friendly numbers with adjustment, (2) creating friendly numbers using addends, (3) adding on from left to right, and (4) adding by counting on
- Understanding adding by 9

- Method 1: change into a "
**friendly**" number and then**adjust**(by subtracting) __Round__one of the addends to the nearest multiple of 10- Then adjust by
__taking away__how much you rounded up by to get the answer

- Method 2: make a "
**friendly**" number using the addends - Use the numbers that were given for the addition equation
- Move values from one number to the other number to make a multiple of 10

- Method 3: adding from left to right
- Add by going through one place value at a time
- i.e. hundreds of 1
^{st}# + hundreds 2^{nd}# + tens of 1^{st}# + tens of 2^{nd}# + . . .

- Method 4: adding by counting on
- Start with the first number, then add the second number one place value at a time

- IntroductionIntroduction to Addition Strategies:a)Mental math and sums of 10b)Addition strategy #1: friendly numbers with adjustmentc)Addition strategy #2: creating friendly numbers using addendsd)Addition strategy #3: adding on from left to righte)Addition strategy #4: adding by counting on
- 1.
**Adding by grouping sums of 10**

Add by pairing up sums of 10. Circle the pair and fill in the blanks.a)8 + 5 + 2 = ____

10 + ____ = ____b)1 + 7 + 3 = ____

10 + ____ = ____c)6 + 9 + 4 = ____

10 + ____ = ____ - 2.
**Adding by 9 strategy**

Add 9 by: adding 10 first, then taking 1 away. Fill in the blanks.a)7 + 9 = ____

7 + 10 = ____ - 1 = ____b)14 + 9 = ____

14 + 10 = ____ - 1 = ____c)38 + 9 = ____

38 + 10 = ____ - 1 = ____ - 3.
**Adding by 8 strategy**

Add 8 by: adding 10 first, then taking 2 away. Fill in the blanks.a)7 + 8 = ____

7 + 10 = ____ - 2 = ____b)16 + 8 = ____

16 + 10 = ____ - 2 = ____c)54 + 8 = ____

54 + 10 = ____ - 2 = ____ - 4.
**Adding using friendly numbers with adjustment**

Add by changing one number into a "friendly" number and adjust. Fill in the blanks.a)b)c) - 5.
**Adding by making friendly numbers with given addends**

Add: make "friendly" numbers using given addends. Fill in the blank.a)b)c) - 6.
**Adding on strategy**

Use the method of adding on from left to right.a)553 + 385 = ____b)730 + 291 = _____c)664 + 148 = ____ - 7.
**Counting on from the first number**

Add by counting on from the first numbera)104 + 693 = ____b)827 + 335 = _____c)568 + 429 = ____