Page 35 - 新思维数学活动用书8 样章
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2 Expressions, formulae and equations
d 50 ⩽ y < 100
5 Match each inequality with the correct number line.
Remember that:
• an open circle (○) is for the < inequality
• a closed circle (●) is for the ⩽ inequality.
The first one is done for you: A and iii
A 2 ⩽ x < 7 i
1 2 3 4 5 6 7 8
B 2 < x < 7 ii
1 2 3 4 5 6 7 8
C 2 < x ⩽ 7 iii
1 2 3 4 5 6 7 8
D 2 ⩽ x ⩽ 7 iv
1 2 3 4 5 6 7 8
Practice
6 Copy each number line. Show each inequality on its number line.
a 5 < x < 9 4 5 6 7 8 9 10
b 12 < x ⩽ 15 11 12 13 14 15 16 17
c −6 < x ⩽ −2 −7 −6 −5 −4 −3 −2 −1
d −1 ⩽ x ⩽ 4 −2 −1 0 1 2 3 4 5
7 Write the inequality shown by each number line. Use the letter x.
a b
24 25 26 27 28 29 29 30 31 32 33 34 35 36
c d
−15 −14 −13 −12 −11 −10 −3 −2 −1 0 1 2 3
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