We have begun this term learning about multiplication in math’s.
A mathematical operation performed on a pair of numbers to get a third number called a product. In simple terms it is repeated addition.
eg: 4 x 3 = 12
4 lots of 3 = 3 + 3+ 3+ 3 = 12
We all learnt some new math’s terms on this particular day of learning. Mrs. Baldwin asked if we knew what a product, factor or array was. There were some great guesses and responses. We found out that a…
Product = answer of a multiplication question
Factors = the numbers that are multiplied together to get another number.
Array: visual representation of repeated addition.
We also had a discussion about prime and composite numbers because we discovered that some numbers only had 2 factors and other numbers had many different factors.
Prime Numbers: a number that has exactly 2 factors, 1 and itself.
Composite Numbers: a number that has more than two factors.
Knowing how many factors a number has tells us if that number is a prime or composite number.
Mrs. Baldwin then demonstrated to us how to complete a long multiplication problem using the standard algorithm strategy. Check out these 2 videos that explain in more detail how to use this strategy.
We then did a mini investigation. Our investigation question was
Find out how many steps you take from where you enter the school grounds to the classroom door and back again in 1 day. How many steps do you make on this journey each week?
To answer this question we went outside to chose the place where we enter the school grounds each morning and then counted how many steps we take from this spot to our classroom door.
We needed to find out how many steps it would take from this point and back again because we enter school at the start of the day and then leave school at the end of the day. Some of us started using repeated addition to work this out, however we soon discovered the quickest way to solve this was to multiply the number of steps by 2.
Finally we needed to calculate the total number of steps in a week (5 days). This proved to be a little more challenging and together as a class we discussed how to work this out. We found out that there were two ways to work this out. We could multiply the number of steps we take one way by 10 because we would make this journey 10 times in a week. The other way would be to multiply our answer we discovered in the first part of the problem by 5.