Rounding

1
Rounding

• Round to the nearest tenth

hundredths
tenths
2
Rounding

• Round to the nearest tenth

To round to the nearest tenth look at the number
to the right (the hundredths place).
If the number is 5 or more, increase the number
in the tenths place.
3
Rounding

• Round to the nearest tenth

hundredths
tenths
4
Rounding

• Round to the nearest tenth

To round to the nearest tenth look at the number
to the right (the hundredths place).
If the number is less than 5 do not increase the
number in the tenths place.
5
Rounding

• Round to the nearest integer

tenths
ones
6
Rounding

• Round to the nearest integer

To round to the nearest integer look at the
number to the right (the tenths place).
If the number is less than 5 do not increase the
number in the ones place.
7
Rounding

• Round to the nearest integer

tenths
ones
8
Rounding

• Round to the nearest integer

To round to the nearest integer look at the
number to the right (the tenths place).
If the number is 5 or more, increase the number
in the ones place.
9
Estimating

• One way to estimate is to round all the numbers
  to the same place value then add
• Round to the nearest tens

tens
10
Estimating

• One way to estimate is to round all the numbers
  to the same place value then add
• Round to the nearest tens

11
Front End Estimate

• Another way to estimate is to add the front end
  digits

1
.1
1
.73
2
.71
12
Front End Estimate

• Another way to estimate is to add the front end
  digits
• Round to estimate the remaining digits

1
.1
.1
.7
1
.73
2
.71
.7
5.5
4
1.5
13
Estimating Products using decimals

• Round to the nearest integer
• Then multiply

14
Estimating quotients using Compatible Numbers

• Compatible numbers are numbers that are easy to
  divide mentally
• Round
• Then divide