Adding and multiplying inequalities
Answers are for parents and teachers.
1
If 1 < a < 4 and 2 < b < 3, estimate a + b.
3 < a + b < 7
2
Under the same conditions estimate ab.
2 < ab < 12
3
If 10 < x < 12, estimate x/2 + 1.
6 < x/2 + 1 < 7
4
If 2 < m < 3 and 1 < n < 2, estimate m - n.
0 < m - n < 2
5
If a square has side 6 < a < 7, estimate its area.
36 < S < 49