Addition Strategy Revision

Today we revised the 3 key addition strategies. They are:

• Place Value Strategy

(Numbers are separated into the tens and ones)

Eg.    45 + 13 = (40 + 10) + (5 + 3)

                        = 50 + 8

                        = 58

- Advanced Place Value Strategy - Holding the biggest number

Or. 57 + 47 = 57 + 40 + 7

                   = 97 + 7

                   = 104

• Rounding and Compensating Strategy

(One of the numbers is rounded up or down to a ‘tidy ten’, an equal amount must then be taken away or added to the other number in the equation to balance it. NB: In addition problems you use two different actions addition/subtraction)

Eg. 63 + 59 = 62 + 60

-1     +1  

                    = 122