4.6 = (4 x 1) + (6/10)
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In expanded notation you would write the number 42,166,037 as: 40,000,000 + 2,000,000 + 100,000 + 60,000 + 6,000 + 30 + 7.
Expanded Notation of 408 = (4 x 100) + (0 x 10) + (8 x 1).
Expanded notation of 900 = (9 x 100) + (0 x 10) + (0 x 1)
The decimal 1.8 in expanded form is (1 x 1) + (8/10). The expanded word form is one and eight tenths.
1+0.3+0.02