Here are the solutions to the exercises:
1. Put proper signs '>', '<', '=' and in the blanks:
- a) 5>3
- b) 2=2
- c) 18>12
- d) 9<15
- e) 0<1
- f) 7>2
- g) 13>11
- h) 5=5
- i) 3=3
- j) 6<9
2. Break up into tens and ones:
- a) 35=3 tens + 5 ones
- b) 28=2 tens + 8 ones
- c) 17=1 ten + 7 ones
- d) 25=2 tens + 5 ones
- e) 42=4 tens + 2 ones