Put proper signs '>', '<', '=' and in the blanks. Break up into tens and ones.

Here are the solutions to the exercises:

1. Put proper signs '>', '<', '=' and in the blanks:

• a) $5 \boxed{>} 3$
• b) $2 \boxed{=} 2$
• c) $18 \boxed{>} 12$
• d) $9 \boxed{<} 15$
• e) $0 \boxed{<} 1$
• f) $7 \boxed{>} 2$
• g) $13 \boxed{>} 11$
• h) $5 \boxed{=} 5$
• i) $3 \boxed{=} 3$
• j) $6 \boxed{<} 9$

2. Break up into tens and ones:

• a) $35 = \boxed{3}$ tens + $\boxed{5}$ ones
• b) $28 = \boxed{2}$ tens + $\boxed{8}$ ones
• c) $17 = \boxed{1}$ ten + $\boxed{7}$ ones
• d) $25 = \boxed{2}$ tens + $\boxed{5}$ ones
• e) $42 = \boxed{4}$ tens + $\boxed{2}$ ones