Next week, the children will be looking at multiplication and division in maths. They will be:
-Multiplying and dividing numbers mentally drawing upon known facts.
-Know and use the vocabulary of prime numbers, prime factors and composite (non-prime) numbers
-Establish whether a number up to 100 is prime and recall prime numbers up to 19.
What are prime numbers?
An introduction to prime numbers, composite numbers and factors. We learn that the number 1 is neither prime nor composite, and the idea of factor pairs is introduced. We look at how to decide whether a natural number is prime or composite by looking for proper factors.
Multiplying and Dividing
The children will multiply 2-digit numbers by x2 to x12, using the following method: 16 x 7 = (10 x 7 = 70) + (6 x 7 = 42) = 70 + 42 = 112.
They will also divide 3-digit numbers by x2 to x12, using the following method: 147 ÷ 7 = (140 ÷ 7 = 20) + (7÷ 7 = 1) = 21
Next term in Year 5 , we will be focusing on the viscous Vikings! This will include: where they are from, what made the come to Britain, as well as the history and background of the Vikings.
Before we do that, Mr Carr and I would like to know what you guys know already about the Vikings. This could include anything from above. It doesn’t have to be long, just a few points about them.
Have a fun, safe half term and well done on all your hard efforts this term.
Year 5 Team
After half term, the children will be looking at factors and multiples in maths. They will be identifying multiples and factors including finding all factor pairs of a number and common factors of two numbers.
Factors are numbers that divide exactly into another number.
The factors of 12, for example, are 1, 2, 3, 4, 6 and 12.
Factors can be shown in pairs. The factors of 12 can be shown:
- 1 and 12 1 x 12 = 12
- 2 and 6 2 x 6 = 12
- 3 and 4 3 x 4 = 12
Each pair multiplies to make 12.
Multiples are really just extended times tables.
- The multiples of 2 are all the numbers in the 2 times table:
2, 4, 6, 8, 10 and so on.
Multiples of 2 always end with a 2, 4, 6, 8 or 0. You can tell 2286, for example, is a multiple of 2 because it ends with a 6.
- The multiples of 5 are all the numbers in the 5 times table:
5, 10, 15, 20, 25 and so on.
Multiples of 5 always end with a 5 or a 0. You can tell 465, for example, is a multiple of 5 because it ends with a 5.
Next week the children will be focusing on addition and subtraction. They will be adding and subtracting whole numbers using formal written methods.
Writing it down
When writing down sums, separate the numbers into ones, tens, hundreds and thousands. List the numbers in a column and always start adding with the units first.
So when adding together 7948 + 1223, you should write it down like this:
Some tips for addition
- Estimate first and check afterwards – it’s a good idea to estimate a rough answer first and then check your actual answer.
- Order doesn’t matter – remember that in addition 394 + 88 is the same as 88 + 394.
- Key words – look out for these words in problems: total, sum, altogether, more. They all indicate an addition calculation.
Writing it down
If the numbers are too high or too difficult to subtract in your head, write them down in columns. Always start subtracting with the ones first. If the digit on top is smaller than the bottom digit then we simply exchange from the column to the left. See example below.
As we are coming to the end of this term, we thought it would be nice for you guys to write a small review about what you have learnt so far during this terms topic. It could be anything to do with the rainforest, life cycles of animals or even a brief book review on the Jungle book itself.
We can not wait to hear from you guys!