Still Confused?

Try reviewing these fundamentals first

- Home
- Grade 4 Math
- Adding and Subtracting Numbers

Still Confused?

Try reviewing these fundamentals first

Nope, got it.

That's the last lesson

Start now and get better math marks!

Get Started NowStart now and get better math marks!

Get Started NowStart now and get better math marks!

Get Started NowStart now and get better math marks!

Get Started Now- Intro Lesson: a6:34
- Intro Lesson: b6:35
- Intro Lesson: c7:29
- Intro Lesson: d4:06
- Lesson: 1a3:07
- Lesson: 1b2:52
- Lesson: 1c2:46
- Lesson: 1d3:47
- Lesson: 2a1:33
- Lesson: 2b1:38
- Lesson: 2c1:28
- Lesson: 3a1:53
- Lesson: 3b2:08
- Lesson: 3c2:00
- Lesson: 4a2:47
- Lesson: 4b2:39
- Lesson: 4c2:43
- Lesson: 5a3:31
- Lesson: 5b3:07
- Lesson: 5c3:54
- Lesson: 6a3:59
- Lesson: 6b5:14
- Lesson: 6c4:05

In this lesson, we will learn:

- The subtraction strategy of: (1) using a friendly number with adjustment, (2) adding to both numbers to create a friendly number, and (3) counting on from the first number (subtrahend)
- Understanding subtracting by 9

- Method 1: change into a "
**friendly**" number then**adjust**(by adding) __Round__one the number being taken away to the nearest multiple of 10- Then
__adjust__by adding how much you rounded by to get the answer

- Method 2: make "
**friendly**" numbers by adding to**both**numbers __Add__to one of the numbers so that it becomes the nearest multiple of 10__Add__the same amount to the other number

- Method 3: subtracting by counting on
- Start with the number you're taking away (the second number)
- Then count up until you get the first number

- IntroductionIntroduction to Subtraction Strategies:a)Mental math and differences of 10b)Subtraction strategy #1: friendly number with adjustmentc)Subtraction strategy #2: friendly number by adding to both numbersd)Subtraction strategy #3: counting on from the first number
- 1.
**Subtracting by breaking up the subtrahend**

Subtract by breaking up the number being taken away.

Fill in the blanks by following the example:

a)57 - 9 = 57 - 7 - ____ = 50 - ____ = ____b)64 - 7 = 64 - ____ - ____ = 60 - ____ = ____c)38 - 9 = 38 - ____ - ____ = 30 - ____ = ____d)92 - 8 = 92 - ____ - ____ = ____ - _____ = _____ - 2.
**Subtracting by 9 strategy**

Subtract 9 by: subtracting 10 first, then putting 1 backa)17 - 9 = ____

17 - 10 = ____ + 1 = ____b)42 - 9 = ____

42 - 10 = ____ + 1 = ____c)35 - 9 = ____

35 - 10 = ____ + 1 = ____ - 3.
**Subtracting by 8 strategy**

Subtract 8 by: subtracting 10 first, then putting 2 backa)15 - 8 = ____

15 - 10 = ____ + 2 = ____b)63 - 8 = ____

63 - 10 = ____ + 2 = ____c)47 - 8 = ____

47 - 10 = ____ + 2 = ____ - 4.
**Subtracting using friendly numbers with adjustment**

Subtract by changing one number into a "friendly" number and adjust. Fill in the blanks.a)b)c) - 5.
**Subtraction strategy: make friendly numbers by adding to both numbers**

Subtract: make "friendly" numbers by adding to both numbers. Fill in the blanks.a)b)c) - 6.
**Subtraction strategy: counting on from the second number**

Subtract by counting on from the second number. Show your work.a)573 - 252 = ____b)408 - 126 = ____c)847 - 639 = ____