Download presentation

Presentation is loading. Please wait.

Published byCole Wells Modified over 4 years ago

1
Using symbols instead of numbers What number can be added to 21 to get 50? + 15 = 277 x = 56 Sometimes questions have a missing number that you need to find.

2
Using symbols instead of numbers What number can be added to 21 to get 50?29 22 + 15 = 277 x 8 = 56 Sometimes questions have a missing number that you need to find.

3
Using symbols instead of numbers We often use a symbol to represent that missing number. Sometimes this is a letter. P + 43 = 804 x n = 24

4
Using symbols instead of numbers We can use a variety of strategies to solve these: TRIAL & ERROR TRIAL & IMPROVEMENT INVERSES

5
Using symbols instead of numbers TRIAL & ERROR – also known as guesswork! This is the most basic method. Guess various numbers and see if they work. It is not very efficient and doesnt always give you the answer. 26 + w = 94

6
Using symbols instead of numbers TRIAL & ERROR – also known as guesswork! This is the most basic method. Guess various numbers and see if they work. It is not very efficient and doesnt always give you the answer. 26 + w = 9480?

7
Using symbols instead of numbers TRIAL & ERROR – also known as guesswork! This is the most basic method. Guess various numbers and see if they work. It is not very efficient and doesnt always give you the answer. 26 + w = 9480? x

8
Using symbols instead of numbers TRIAL & ERROR – also known as guesswork! This is the most basic method. Guess various numbers and see if they work. It is not very efficient and doesnt always give you the answer. 26 + w = 9470?

9
Using symbols instead of numbers TRIAL & ERROR – also known as guesswork! This is the most basic method. Guess various numbers and see if they work. It is not very efficient and doesnt always give you the answer. 26 + w = 9470? x

10
Using symbols instead of numbers TRIAL & IMPROVEMENT – educated guesswork that gets more accurate! This method usually gets you to the answer, but can take a long time. It helps if you say if the answer is too big, too small, or correct. 26 + w = 9480?gives 106 – too big! So lets look at numbers less than 80.

11
Using symbols instead of numbers TRIAL & IMPROVEMENT – educated guesswork that gets more accurate! This method usually gets you to the answer, but can take a long time. It helps if you say if the answer is too big, too small, or correct. 26 + w = 9470?gives 96 – too big! So lets look at numbers less than 70.

12
Using symbols instead of numbers TRIAL & IMPROVEMENT – educated guesswork that gets more accurate! This method usually gets you to the answer, but can take a long time. It helps if you say if the answer is too big, too small, or correct. 26 + w = 9460?gives 86 – too small! So lets look at numbers between 60 and 70.

13
Using symbols instead of numbers TRIAL & IMPROVEMENT – educated guesswork that gets more accurate! This method usually gets you to the answer, but can take a long time. It helps if you say if the answer is too big, too small, or correct. 26 + w = 9465?gives 91 – too small! So lets look at numbers between 65 and 70.

14
Using symbols instead of numbers TRIAL & IMPROVEMENT – educated guesswork that gets more accurate! This method usually gets you to the answer, but can take a long time. It helps if you say if the answer is too big, too small, or correct. 26 + w = 9467?gives 93 – too small! So lets look at numbers between 67 and 70.

15
Using symbols instead of numbers TRIAL & IMPROVEMENT – educated guesswork that gets more accurate! This method usually gets you to the answer, but can take a long time. It helps if you say if the answer is too big, too small, or correct. 26 + w = 9469?gives 95 – too big! So lets look at numbers between 67 and 69.

16
Using symbols instead of numbers TRIAL & IMPROVEMENT – educated guesswork that gets more accurate! This method usually gets you to the answer, but can take a long time. It helps if you say if the answer is too big, too small, or correct. 26 + w = 9468?Gives 94 – correct!

17
Using symbols instead of numbers TRIAL & IMPROVEMENT – educated guesswork that gets more accurate! This method usually gets you to the answer, but can take a long time. It helps if you say if the answer is too big, too small, or correct. 26 + w = 94w = 68

18
Using symbols instead of numbers INVERSES – using the undo method. This method will always get you the answer, and will often be the quickest method. It is, however, slightly trickier. 26 + w = 94 The INVERSE of + is -

19
Using symbols instead of numbers INVERSES – using the undo method. This method will always get you the answer, and will often be the quickest method. It is, however, slightly trickier. w = 94 - 26 The INVERSE of + is -

20
Using symbols instead of numbers INVERSES – using the undo method. This method will always get you the answer, and will often be the quickest method. It is, however, slightly trickier. w = 68 The INVERSE of + is -

21
Using symbols instead of numbers INVERSES – using the undo method. This method will always get you the answer, and will often be the quickest method. It is, however, slightly trickier. d x 9 = 54 The inverse of x is ÷

22
Using symbols instead of numbers INVERSES – using the undo method. This method will always get you the answer, and will often be the quickest method. It is, however, slightly trickier. d = 54 ÷ 9 The inverse of x is ÷

23
Using symbols instead of numbers INVERSES – using the undo method. This method will always get you the answer, and will often be the quickest method. It is, however, slightly trickier. d = 6 The inverse of x is ÷

24
Using symbols instead of numbers Try these: 6 + a = 19 b + 43 = 60 15 – c = 2Be careful with these ones d – 26 = 90 e x 4 = 32 7 x f = 77 g ÷ 10 = 120 300 ÷ h = 6

25
Using symbols instead of numbers Try these: 6 + a = 19a = b + 43 = 60b = 15 – c = 2c = d – 26 = 90d = e x 4 = 32e = 7 x f = 77f = g ÷ 10 = 120g = 300 ÷ h = 6h =

26
Using symbols instead of numbers Try these: 6 + a = 19a = 19 - 6 b + 43 = 60b = 60 – 43 15 – c = 2c = 15 - 2 d – 26 = 90d = 90 + 26 e x 4 = 32e = 32 ÷ 4 7 x f = 77f = 77 ÷ 7 g ÷ 10 = 120g = 120 x 10 300 ÷ h = 6h = 300 ÷ 6

27
Using symbols instead of numbers Try these: 6 + a = 19a = 13 b + 43 = 60b = 17 15 – c = 2c = 13 d – 26 = 90d = 116 e x 4 = 32e = 8 7 x f = 77f = 11 g ÷ 10 = 120g = 1200 300 ÷ h = 6h = 50

Similar presentations

Presentation is loading. Please wait....

OK

2011年上半年 我院团学工作活动图片展播 2011年8月28日.

2011年上半年 我院团学工作活动图片展播 2011年8月28日.

© 2018 SlidePlayer.com Inc.

All rights reserved.

Ads by Google

Ppt on stars and planets Ppt on nestle india ltd foods Ppt on review of literature apa Download ppt on fibonacci numbers Ppt on switching devices on clash Ppt on human resource management system project Ppt on uniform circular motion for class 9 Ppt on recycling of waste Ppt on programmable logic array tutorial Ppt on low level language examples