Classwork Week 3 - for completion in class Square & Triangular Numbers

Watch the video below and pause it at 6 minutes 45 seconds to answer the following questions:

TRIANGULAR NUMBERS:

1. Why are they called triangular numbers? 
2. How many gifts would I receive on the 12th day of Christmas?

Now continue watching the clip to the end of the video and answer the following questions:

SQUARE NUMBERS:

1. Why are they called square numbers?
2. What is the square root of 49?
3. What are all the square numbers up to 12 squared? Please record each like this: 

NOTE: Your responses should be recorded neatly in your Maths journals