seven and nineteen hundredths
719 = (7 x 100) + (1 x 10) + (9 x 1)
Writing a number in standard form simply means to express the number in its 'normal' form. Therefore, the way you wrote the number is the standard form for your example.
How to write 64.218 in word form
write the word form and expanded form of the number four
12 in word form is twelve.
2118077 word form
Seven tenths.
seven and forty two one hundredths
You can write 5.24 in word form as five and twenty-four hundredths
It is 719/1000
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You can write 14.12 in word form as fourteen and twelve hundredths