###### Sunnyvale

######

###### Saturday

###### Level 3

## Mr. Rodney

### Target 1

###### Lesson Type:

Review

Number Operation

:

Operational Relationships

Use properties of operations as strategies for solving arithmetic problems.

###### Supporting targets:

###### 1:

Identify the Associative Property of Addition.

###### 2:

Understand that the associative property is about grouping factors in an addition equation without changing the sum.

###### 3:

Although computation often is necessary to solve in the order given, with addition, addends can be computed in an order that produces more “friendly” numbers.

###### 4:

###### 5:

###### Grade:

3rd

###### Vocabulary:

Addend, Sum, Associative Property of Addition, Group

Activities:

- reviewed the Associative Property of Addition, understanding that in an addition sentence of 3 or more addends, addends can be grouped in any order using parentheses and will not change the sum.
- solved basic addition expressions and linked the two with equal sums.
- deconstructed the original addition 2-addend sentences given into 3 addends in such a way that both 2-addend equations used the same addends.
- in each new equation, used the Associative Property of Addition to group the addends in different ways.

### Home Exploration

###### Challenge Problem:

Solve and pair up the addition sentences with equal sums. Use the Associative Property of Addition so to create new addition sentences with 3 addends and use parentheses to group the different addends.

###### Challenge Data:

• 4+8

• 22+14

• 10+7

• 17+19

• 9+15

• 2+10

• 25+17

• 11+13

• 5+12

• 31+11

###### Guiding Questions:

- Let's take one "clue" (an addend) from each of the addition sentences. Should we use the greater or lesser addend? (The lesser of the addends is used)
- Now let's take another clue from the equation with the matching sum. Which addend should we use?
- Okay, now we have to figure out what the missing number is. How much more do we need to equal the original sum?

###### Challenge Answer:

Possible solutions:

• 4 + 8 = 4 + (2 + 6); 2 + 10= 2 + (4 + 6)

• 10 + 7 = (5 + 5) + 7; 5 + 12 = 5 + (5 + 7)

• 11 + 13 = 11 + (9 + 4); 9 + 15 = 9 + (11 + 4)

• 25 + 17 = (11 + 14) + 17; 31 + 11 = (14 + 17) + 11

• 17 + 19 = 17 + (14 + 5); 22 + 14 = (17 + 5) + 14

### Target 2

###### Lesson Type:

###### Review

###### Critical Thinking

###### Logical Reasoning

###### Use reasoning to solve logic puzzles.

:

###### Supporting targets:

###### 1:

Use the given information in a problem to identify the correct answer.

###### 2:

Use the given information to determine which is not the correct answer.

###### 3:

Think outside of the box to solve problems.

###### 4:

Follow given rules to solve problems.

###### 5:

###### Grade:

3rd

###### Vocabulary:

Growing Sequence, Pattern

Activities:

- studied a sequence of graphics and shapes.
- determined the pattern in which the images are changing.
- applied the pattern rule to draw what image would come next in the sequence.

### Home Exploration