Lesson 11: Add to 10 First.   8 + 5 + 2 + 5 =?

 

Rounded Rectangular Callout: Method 1: Add all addends from the left to the right. Rounded Rectangular Callout: Method 2: Regroup the addends to add to 10 first. Rounded Rectangular Callout: Addend is a number in an addition. 8 and 5 are addends in the addition 8 + 5.
 

 

 
 

 
                          

 

 

 

   8 + 5 + 2 + 5

= 13 + 2 + 5

= 15 + 5 = 20

 
 

   8 + 5 + 2 + 5

= (8 + 2) + (5 + 5)

= 10 + 10 = 20
 

 
 

 

 

 

 

 


Exercise 11: Add to 10 first.

 

(1)   Add to 10 first. Link two addends whose sum is 10.

 


8 + 4 + 2 + 6 = 10 + 10 = 20                       3 + 2 + 7 + 8 =

 

5 + 9 + 1 + 5 =                                              7 + 9 + 1 + 3 =

 

7 + 1 + 9 + 3 =                                              3 + 6 + 7 + 4 =

 

4 + 8 + 2 + 6 =                                             3 + 9 + 7 + 1 =

 

7 + 2 + 8 + 3 =                                              5 + 3 + 5 + 7 =

         

(2)   Can you move only one dot to make all sides to have the same dots?

 

 

 

 

 

 

 

 

 

 

 


Lesson 3: Multiplying by 1 and Adding 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


Lesson 4: Counting the Squares of Any Size in the Figures

Rounded Rectangular Callout: How many squares of any size are there?         

 

 

 

 

 

 

 

 

 

 

 

 

 

 


                                                                     

Exercise 4: Count the squares of any size in the figure.

 


(1)                                                               (2)

 

 

 

 

 

 

 

 

 


(3)                                                               (4)