Expanded Form
Word Form
Addition
Subtraction
Multiplication
100

283

(2x100)+(8x10)+(3x1)

100

3.4

three and four tenths

100

0.2+0.5

0.7

100

0.8-0.3

0.5

100

9 sets of 0.3

2.7

200

4.5

(4x1)+(5x0.1)

or 

(4x1)+(5x1/10)

200

42.87

forty-two and eighty-seven hundredths

200

1.8+0.4

2.2

200

1.6-0.7

0.9

200

2 copies of 1.4

2.8

300

2.86

(2x1)+(8x0.1)+(6x0.01)

300

62.03

sixty-two and three hundredths

300

1.5+0.001

1.51

300

25.8-4.02

21.78

300

7 groups of 0.23

1.61

400

40.25

(4x10)+(2x0.1)+(5x0.01)

or 

(4x10)+(2x1/10)+(5x1/100)

400

4.059

four and fifty-nine hundredths

400

7.8+22.4

30.2

400

21.78-0.009

21.771

400

10 x 0.45

4.5

500

64.051

(6x10)+(4x1)+(5x0.01)+(1x0.001)

or

(6x10)+(4x1)+(5x1/100)+(1x1/1000)

500

726.342

seven hundred twenty six and three hundred fourty-two thousandths 

500

482.607+45.19

527.797

500

100.52-35.7

64.82

500

1,000 x 3.8

3,800