Page 38 - 新思维数学活动用书7 样章
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2.6 Inequalities
2.6 Inequalities
Remember: < means ‘is less than’
> means ‘is greater than’. Key words
inequality
Exercise 2.6 integer
Focus
1 Write ‘true’ or ‘false’ for each of these statements. The first one has been done for you.
a x < 9 means ‘x is less than 9’. True
b x > 3 means ‘x is less than 3’.
c x < 2 means ‘x is greater than 2’.
d x > 7 means ‘x is greater than 7’.
2 Match each inequality (A to D) with its correct meaning (i to iv).
The first one has been done for you: A and ii.
A x > 4 i x is less than 12.
B x < 4 ii x is greater than 4.
C x > 12 iii x is less than 4.
D x < 12 iv x is greater than 12.
3 Write these statements as inequalities. The first one has been done for you.
a x is greater than 2. x > 2 b y is greater than 5.
c m is less than 15. d b is less than 7.
4 Match each inequality (A to D) with its correct number line
(i to iv). The first one has been done for you: A and iv. Tip
Remember:
A x > −5 i You use an
3 4 5 6 7 open circle (o)
B x < 5 ii for the < and
–9 –8 –7 –6 –5 –4 > inequalities.
C x < −5 iii
3 4 5 6 7
D x > 5 iv
–6 –5 –4 –3 –2 –1
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