Page 7 - Math Smart - 7

In this chapter
CHAPTER 1.1 Pupils should be able to:

• recognise factors
Recognising Factors, • recognise multiples

• recognise prime
numbers
Multiples and Prime • use the sieve of

Eratosthenes to
generate prime
Numbers numbers

Following a recipe when baking can be tricky, especially if you want to make
more than what Is in the recipe. You might need to calculate multiples of the
amount of ingredients needed in the recipe.

Think and Share

You could use multiples to calculate the ingredients if
you need to bake more than 1 loaf of bread.
1 loaf of briMcl
For example, if you want to bake 2 loaves of bread, you
will need 600 g (2 x 300 g) of wholemeal flour.
~^=M
For 3 loaves of bread, you will need 900 g (3 x 300 g) ^00 ^ whole-Me-al four
of wholemeal flour. For 4 loaves of bread, you will ^00 ^ bread four
need 1200 g (4 x 300 g) of wholemeal flour. 2 f?p dr\cd
2 f6?p brown ^u^r
You are using the multiples of 300 to calculate how
1 f;p ?alf
much wholemeal flour you would need to make more
1 cAi^ rolled oaiK
loaves of bread!
2 +i>^p olive- oil
i5i9 ryil warm wafer
1 C-fffi.

^ RECALL

Recall how we represent a multiplication using dot array. These diagrams
show how we can represent the number 12 using the area of a rectangle.
/
• • ••••• • • • • • •
i 1
• • :; Ml!
• • ##•••#
•
# • • •
4 by 3 • 12by 1 « •

4 and 3 are factors of 12 6 and 2 are factors of 12 12 and 1 are factors of 12

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