Numbers with Two Decimal Digits  Hundredths
This is a complete lesson with instruction and exercises about numbers with two decimal digits (hundredths), meant for fourth grade. On a number line, we get hundredths by simply dividing each interval of onetenth into 10 new parts. Or, we can look at fractions. The video below also includes an explanation of why you can "tag" or "add" zeros to the end of a decimal and its value does not change.
You have seen this number line in the previous lesson. In it, the distance from 0.0 to 0.1 is one tenth. Now, we will DRAW nine tiny lines between 0.0 and 0.1, dividing that distance into TEN new parts.
Now, repeat this process between 0.2 and 0.3, dividing that distance into TEN new parts. If you repeated this process between
0.3 and 0.4, and then between 0.4 and 0.5, etc., These new parts are therefore hundredth parts, or hundredths. 

The number line below zooms in to the previous number line, from 0 to a little past 0.3. The interval from 0 to 0.1 has been divided into ten parts, and similarly the interval from 0.1 to 0.2, etc.
Each interval is one hundredth. Now look at the numbers below the
tick marks.


We can also illustrate hundredths by dividing a square into a hundred parts.

1. Color parts to show the equalities. Write the decimal in (b) and (c).
a. 0.50 = 0.5 
b. 0.10 = _____ 
c. 0.80 = ______ 
2. What numbers do the pictures illustrate? Write them as a fraction and as a decimal.
a.  b. 
c.  d. 
3. Color to illustrate the decimals. Then write them as fractions.
a. 0.52 = 
b. 0.7 = 
c. 0.09 = 
d. 1.08 = 
4. Write the fractions as decimals.







5. Write as fractions.
a. 0.02  b. 1.49  c. 5.5  d. 3.08  e. 10.06 
6. Mark these decimals on the number line below:
1.55 1.11 1.28 1.39 1.88 1.02 1.67 1.99 1.74 1.43 1.90 1.06 1.20
7. Fill in the missing hundredth parts under the tick marks on the number lines.
8. Make a number line with the hundredths tick marks from 0.6 till 0.7.
9. We also use decimal numbers to write money amounts.
A cent is a
hundredth part of a dollar.
So $5.12 means 5 whole dollars and 12 hundredths of a dollar,
or 12 cents.
With dollarcent amounts, we
always use two decimal digits after the point.
So, what is the usual way of writing $0.6 ?
10. Compare. Write <, >, or = between the numbers.
a. 0.51  0.49  b. 4.5  4.50  c. 0.1  0.01  d. 0.50 


e. 1.12  1.35  f. 5.35  3.58  g. 4.06  4.6  h. 2.7  2.07  
i. 2.67 

j. 1.01  1.1  k. 1.7 

l. 4.12  4.2 
This lesson is taken from my book Math Mammoth Decimals 1.
Math Mammoth Decimals 1
A selfteaching worktext for 4th grade that gives a solid foundation for decimals. It covers tenths and hundredths, comparing decimals, adding and subtracting decimals both mentally and in columns, multiplying decimals by whole numbers, rounding, estimating, and money problems.
Download ($3.50). Also available as a printed copy.