Page 22 - 新思维数学学生用书8 样章

1.3 Square roots and cube roots

13 Any number that can be written as a fraction is a rational number. Tip
9
3
Examples are 7 , −12 18 , 6, , −2 10
1
4
25
15
Here is a list of six numbers: Integers and
1
1
5 − −500 16 −4.8 99 fractions are
2
5
Write included in the
a all the integers in the list set of rational
b all the natural numbers in the list numbers.
c all the rational numbers in the list.
14 This Venn diagram shows the relationship I
between natural numbers and integers. N
N stands for natural numbers and I for
integers.
a Copy the Venn diagram.
b Write each of these numbers in the

correct part of the diagram.
1 −3 7 −12 41 −100 2 1 Tip
2
c Add another circle to your Venn diagram to show

rational numbers. Remember, all
d Add these numbers to your Venn diagram. integers are
3
−8 3 0 6.3 − 10 included in the
7 5 3 rational numbers.
e Give your diagram to a partner to check.

Summary checklist

I can find and recognise square numbers and their two corresponding square
roots.
I can find and recognise positive and negative cube numbers and their cube

roots.
I can recognise natural numbers, integers and rational numbers.

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