1. Find the missing numbers.
9 + a < 12
a = ...............................
8 + m < 15
m = ..............................
5 + e < 13
e = ...............................
12 - c > 9
c = ............................
11 - y > 7
y = ............................
14 - x = 8
x = .............................
2. Write the right ones.
3. Compare. <, >,=
15 > 5, because 5 +..... = 15
4 ... 20,because..... + ..... = .....
18 ... 20, because ..... + ..... = .....
14 ... 12, because ..... + ..... = .....
20 ..... 14, because ...................................
18 ..... 8, because ..................................
13 ..... 9, because..................................
19 ..... 17, because ..................................
4. Write yourself.
5. Calculate.
3 + 7 < a < 12 a = ...... ......
4 + 8 < a < 14 a = ...... ......
5 + 9 < a < 16 a = ...... ......
6 + 9 < a < 17 a = ...... ......
20 -11< a < 11 a = ...... ......
18 - 8< a < 12 a = ...... ......
19 - 5< a < 16 a = ...... ......
