Write the expanded form for each number in standard form.

Here are the numbers for each expanded form:

• a) 6 thousand 2 hundreds 9 tens 0 ones

  $$6 \times 1000 + 2 \times 100 + 9 \times 10 + 0 \times 1 = 6000 + 200 + 90 + 0 = \boxed{\text{6290}}$$

• b) 5 thousand 3 hundreds 7 tens 1 ones

  $$5 \times 1000 + 3 \times 100 + 7 \times 10 + 1 \times 1 = 5000 + 300 + 70 + 1 = \boxed{\text{5371}}$$

• c) 4 thousand 4 hundreds 5 tens 4 ones

  $$4 \times 1000 + 4 \times 100 + 5 \times 10 + 4 \times 1 = 4000 + 400 + 50 + 4 = \boxed{\text{4454}}$$