Number Sense – Term 2 Big Ideas:
Grade 2 – Development of computational fluency in addition and subtraction with numbers to 100 requires an understanding of place value
     

Adding & Subtracting Double Digits with Regrouping
   

Video:  Subtraction with Regrouping

Grade 3 – Development of computational fluency in addition, subtraction and multiplication of whole numbers requires flexible decomposing and composing

Video:  Subtracting with regrouping across zeros

Multiplication:  Learning this concept involves understanding of repeated addition and arrays.  What is an array?  It is arranging a number objects in equal groups or in equal rows and columns.
     
3 x 4 = 12                            5 x 6 = 30

When multiplying numbers, we can use repeated addition to find the answer or product.

Videos:
https://www.youtube.com/watch?v=MeidqzJNA2o
https://www.youtube.com/watch?v=QphXFi30aFk

References:

 Vocabulary:  digit, add, subtract, sum, difference, compose & decompose; addend & minuend

Decomposing a whole number means to break the number into smaller parts (10s & 1s)
      

Computational Strategies: