3-1 Estimating Fractions and Mixed Numbers
A.) Estimating sums and differences of fractions
One way to estimate sums/differences of fractions
is to round the fractions to either 0, , 1 and then
add or subtract.
•
0
½
•
½
1
1
Comparing Fractions to 1, 0 or
.
These fractions are close to zero.
What do you notice about these fractions?
These fractions are close to one.
What do you notice about these fractions?
These fractions are close to
What do you notice about these fractions?
Put the following fractions in the correct box.
More than
Less than
Round the following fractions to either 0,
0
½
, 1.
1
½
Estimate the following sums/differences. First round
each fraction to 0, , 1, then add or subtract.
½
a.)
+
b.)
- c.)
+
B.) Estimating with Mixed Numbers
Step: Round each mixed number to the nearest whole
number then perform the operation (+, -, x)
a.)
+
b.)
- c.)
•
Step: When estimating quotients (review), round
the divisor first, then replace the dividend
with the nearest compatible #.
a.) b.)
÷
÷
Demonstrate Understanding: Estimate
1.)
-
+
2.)
3.)
4.)
•
÷