Dividing by Powers of 10 To divide a decimal number by a power of 10 in the form
move the decimal point k places to the left. For example, 123.4 ÷ 100 = 1.234. Simplify each expression mentally.
(a) 78.89 ÷ 100
(b) 0.05 ÷ 1000
(c) 5678 ÷ 10,000
(d) −9.8 ÷ 1000
(e) −101 ÷ 100,000
(f) 7.8 ÷ 100
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