ALGEBRA.

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Presentation transcript:

ALGEBRA

Felicia is a primary 6 student. She is 10 years old. How old will Felicia be in 1 years time? Felicia will be 11 years old in 1 years time. 10 + 1 How old will Felicia be in 2 years time? Felicia will be 12 years old in 2 years time. 10 + 2

Jojo is a new student in primary 6. The class doesn’t know how old he is. Let say, Jojo is k years old. k represents Jojo’s age. k = Jojo’s age

How old will Jojo be in 1 years time? k + 1 Jojo will be (k + 1) years old in 1 years time. How old will Jojo be in 2 years time? k + 2 Jojo will be (k + 2) years old in 2 years time.

How old was Jojo 1 year ago? k – 1 Jojo was (k – 1) years old 1 year ago. How old was Jojo 2 year ago? k – 2 Jojo was (k – 2) years old 2 year ago.

Jojo's Age Now k 10 Next 1 year k + 1 10 + 1 Next 2 year k + 2 10 + 2 Next 3 year k + 3 10 + 3 Next 4 year k + 4 10 + 4 1 year ago k - 1 10 - 1 2 year ago k - 2 10 - 2 3 year ago k - 3 10 - 3 4 year ago k - 4 10 - 4