New or Recently Introduced Terms 
 Decimal expanded form (e.g., (2 × 10) + (4 × 1) + (5 × 0.1) + (9 × 0.01) = 24.59)

 Decimal fraction (a fraction with a denominator of 10, 100, 1,000, etc.)

 Decimal number (a number written using place value units that are powers of 10)

 Decimal point (a period used to separate the whole number part from the fractional part of a decimal number)

 Fraction expanded form (e.g., (2 × 10) + (4 × 1) + (5 × 1 10) + (9 × 1 100) = 24 59 100)

 Hundredth (a place value unit such that 100 hundredths equals 1 one)

 Tenth (a place value unit such that 10 tenths equals 1 one)