6th Grade Math Textbook, Fundamentals

Lesson 7-10 for exercise sets. &KDSWHU 

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Calculate a 10% tip.

• Multiply $32 by 10%.
  10% of $32 0.1 • $32
  Move the decimal point
  one place to the left.
  Tip: $3.20


• Add: $31.50 $3.20
  Total cost: $34.70

Calculate a 15% tip.

• 15% 10% 5%


• 10% $3.20


• 5% half of 10%, and
  half of $3.20 $1.60


• Add: $3.20 $1.60 $4.80
  Tip: $4.80


• Add: $31.50 $4.80
  Total cost: $36.30

Calculate a 20% tip.

• 20% 10% 10%


• 10% $3.20


• 20% 2 • $3.20 $6.40
  Tip: $6.40


• Add: $31.50 $6.40
  Total cost: $37.90

You can use a Sales Tax Table to compute the

amount of sales tax and the total cost.

Use the 6% sales tax table at the right to

find the amount of sales tax and the total

cost of a printer cartridge marked at $20.95.

Find $20.95 in the range of prices in the table.

$20.95 is in the row for $20.92–$21.08.

Look across the row.

The tax for prices in that range is $1.26

Add the sales tax to the marked price to

find the total cost.

$20.95 $1.26 $22.21

The total cost of the printer cartridge is $22.21.

A common application of percents is leaving a tip, or gratuity,

for service provided in places such as restaurants or hotels.

You can use rounding, benchmark percents, and mental math to calculate a tip.

Calculate the tip and total cost for a dinner that costs $31.50.

Round the amount up to the next dollar: $31.50 $32.

Find the amount of sales tax and the total cost.

1.a $450 rug with 5 % sales tax rate 2.a $926 dresser with a 3.5% sales tax rate

Find the tip and the total cost. Round and use mental math.

3.a $48.75 meal with a 10% tip 4.a $31 food delivery with a 5% tip

5.a $39.85 dinner with a 20% tip 6.a $9.75 taxi ride with a 15% tip

7.Discuss and Write How can you estimate the amount of sales tax and

the total cost of an item? Support your explanation with an example

from this lesson.

1

2

Sale Tax

$0.00–$0.08 $0.00

0.09– 0.24 .01

0.25– 0.41 .02

0.42– 0.58 .03

0.59– 0.74 .04

0.75– 0.91 .05

0.92– 1.08 .06

Sale Tax

$20.09–$20.24 $1.21

20.25– 20.41 1.22

20.42– 20.58 1.23

20.59– 20.74 1.24

20.75– 20.91 1.25

20.92– 21.08 1.26

21.09– 21.24 1.27