Triangles Maths Group.

Triangles Maths Group.

Piri, Maia and Ollie are planning to make pikelets for afternoon tea. The recipe need 3/4 cups of milk to make a batch of 25 pikelets. How many cups will they need to make 100 pikelets?

They discover that they have 5 1/2 cups of milk. How many batches of pikelets will they be able to make?

3 whole cups of milk can make 100 pikelets. There are 2 1/2 more cups of milk left. I added another half to the 2 1/2 cups so that it can equal 3 whole cups and that makes another 100 pikelets. I took away half of 100 which is 50. (100 - 50 = 50), and then I added 100 and 50 together

( 100 + 50 = 150). So Piri, Maia and Ollie makes 150 batches of pikelets.

Factor Tress.

                         Factor Trees.

                                  25

                                ↙  ↘

                               5      5

                            ↙ ↘   ↙ ↘

                           5    1   5    1

                                  15

                                ↙  ↘

                              3      5

                           ↙  ↘  ↙  ↘

                          3     1  5     1

                              

Equal Addition.

TEACHING ADDITION, SUBTRACTION, AND PLACE VALUE, BOOK 5, PAGE 38

EQUAL ADDITION

WALT: I am learning to solve subtraction problems by equal additions that turn one of the numbers into a tidy number.

Activities 1 - 4

WALT: Solve subtraction problems by equal additions that turn one of the numbers into a tidy number.

Prior Knowledge Required: To do this I need to be confident adding to a number to change it into a tidy number.

1)

Question	Answer	Question	Answer
A. 348 + = 350	348 + 2 = 350	F. 96 +  = 100	96 + 4 = 100
B. 212 -  = 210	212 - 2 = 210	G. 142 -  = 140	142 - 2 = 140
C. 456 +  = 460	456 + 4 = 460	H. 117 +  = 120	117 + 3 = 120
D. 711 -  = 710	711 - 1 = 710	I. 196 +  = 200	196 + 4 = 200
E. 314 -  = 310	314 - 4 = 310	J. 214 -  = 210	214 - 4 = 210

New Strategy with Materials: Remember subtraction is all about finding the difference between two numbers or subtract the same amount from both numbers the difference will remain the same.

2) You may use a number line or empty number line to answer these questions. For question a) I added 4 to 596 to make 600 which is a tidy number. Since I added 4 to 596 I also had to add 4 to 661.

Question	Change it to a tidy number	Answer
A. 661 - 596 =	665 - 600 =	65
B. 467 - 399 =	468 - 400 =	68
C. 543 - 397 =	547 - 400 =	147
D. 552 - 496 =	556 - 500 =	56
E. 234 - 96 =	238 - 100 =	138
F. 467 - 295 =	472 - 300 =	172
G. 900 - 198 =	902 - 200 =	702

3) Do not use a number line to answer these questions.

Question	Change it to a tidy number	Answer
A. 601 - 299 =	602 - 300 =	302
B. 750 - 96 =	754 - 100 =	654
C. 805 - 96 =	809 - 100 =	709
D. 506 - 196 =	510 - 200 =	310
E. 765 - 290 =	765 - 290 =	475

Don't Subtract - Add.

Teaching Addition, Subtraction, and Place Value, Book 5, Page 34

Don’t Subtract - Add!

WALT: I am learning that problems like 34 + ------ = 51 and  51 - 34 = ------ have the same answer.

Success Criteria: I am able to solve addition and Subtraction problems by using the strategy of adding and not subtracting.

A.

Question	Answer	Question	Answer
1. 23 + .....-=60	37	6. 38 + .....=52	14
2. 54 + .....=70	16	7. 67 + .....=76	9
3. 16 + .....=30	14	8. 18 + .....=82	64
4. 27 + .....=72	45	9. 56 + ......=88	32
5. 76 + .....=85	9	10. 18+ .....=42	24

B. Materials

Question	Addition and answer	Question	Addition and answer
1. 50 - 47 =	47 + 3 = 50	6. 33 - 26 =	26 + 7 = 33
2. 63 - 59 =	59 + 4 = 63	7. 23 - 18 =	18 + 5 = 23
3. 80 - 78 =	78 + 2 = 80	8. 81 - 18 =	18 + 63 = 81
4. 83 - 77 =	77 + 6 = 83	9. 75 - 39 =	39 + 36 = 75
5. 63 - 57 =	57 + 6 = 63	10. 103 - 88 =	88 + 5 = 103

C. Imaging

Question	Answer	Question	Answer
1. 86 - 69 =	17	7. 74 - 56 =	18
2. 45 - 37 =	11	8. 47 - 27 =	20
3. 14 - 8 =	6	9. 83 - 67 =	16
4. 50- 29 =	21	10. 65 - 39 =	26
5. 90 - 57 =	13	11. 91 - 18 =	87
6. 55 - 29 =	26	12. 53 - 47 =	6

D. Word Problems - Number Properties

1. Karl had 38 lollies and he ate 9. How many lollies did he have

left?                         38 - 9 = 29

2. Fusi had 75 marbles but lost 13. How many did she have left?

                                         75 - 13 = 62

3. Moses has 130 biscuits and he ate 27. How many did he have

left?                        130 - 27  =113

4. Levi G had 67 toy cars. He gave 19 toy cars to Jayden. How

many did he have left? 67 - 19 = 49

5. Anthony had $53. He spent $17. How many dollars did he

have left?              $53 - $17 = 36

6. Levi R had 74 oranges and he ate 27. How many did have

left?                          74 - 27 = 47

7. Jahsiah had 42 tennis balls. He lost 18. How many were left?

                                          42 - 18 = 24