Transcript Estimating Sums/Differences

Warm-Up
Write the answer you got on
#2, 4, 6 p.710 in word form.
Example: 0.8 > 0.67
eight tenths is greater than
sixty-seven hundredths
Multiplication Estimation
• When multiplying, Always round to the
highest place value of each number!!! DO
NOT round single digits!
• Always drop the decimal point and the
zeroes after the decimal!!!
Each house needs
18.7 bags of
candy.
There are 7
houses that need
candy.
How many bags of candy does he need?
25.98
X 15
30.00
x
20
600
157.09
200
X 33.57
30
6,000
x
Division Estimation
• When dividing, Always round to division
friendly numbers!!! DO NOT round single
digits!
• Always drop the decimal point and the
zeroes after the decimal!!!
The neighborhood
needs 302.8 pieces
of candy.
Each house gets
about 48.2 pieces of
candy to hand out.
About how many houses are in the neighborhood?
=
23.8 82.5
7 22.98
7
21
=
3
20
80
=
4