Using Estimation and Benchmark Percents

Calculate 10% of the following numbers.
Hint: Move the decimal point to the LEFT ONCE. If it's a whole number, the decimal point is originally after the number.

• 8

• 10% of 80

• 6.705

• 10% of 84.5

• 8.45

• 10% of 25

• 30.69

• 10% of 67.05

• 2.5

• 10% of 306.9

Tags

CCSS.6.RP.A.3C

Calculate 1% of the following numbers.
Hint: Move the decimal point to the LEFT TWICE. If it's a whole number, the decimal point is originally after the number.

• 1.215

• 1% of 80

• 2.35

• 1% of 235

• 0.08

• 1% of 121.5

• 8

• 1% of 8

• 0.8

• 1% of 800

Tags

CCSS.6.RP.A.3C

If 450 is 100%. Calculate each value.

Groups:

(a) 50%

,

(b) 25%

,

(c) 10%

,

(d) 5%

• 22.5

• 112.5

• 45

• 225

Tags

CCSS.6.RP.A.3C

If 240 is 100%. Calculate each value.

Groups:

(a) 50%

,

(b) 25%

,

(c) 10%

,

(d) 5%

• 120

• 60

• 24

• 12

Tags

CCSS.6.RP.A.3C

If 16 is 100%. Calculate each value.

Groups:

(a) 50%

,

(b) 25%

,

(c) 10%

,

(d) 5%

• 8

• 0.8

• 4

• 1.6

Tags

CCSS.6.RP.A.3C

Determine 88% given using 10%, 5%, and 1%.​ ​ (a)   ​ (b)   ​ (c)  

• 8(10%)
• 5%
• 3(1%)
• 7(10%), 4%, 2(1%)
• 9(10%), 6%, 1(1%)
• 6(10%), 7%, 4(1%)

Tags

CCSS.6.RP.A.3C

Determine 14% given using 10%, 5%, and 1%.​ ​ (a)   ​ ​ (b)  

• 10%
• 4(1%)
• 15%, 3(1%)
• 12%, 2(5%)
• 20%, 1(10%)

Tags

CCSS.6.RP.A.3C

Determine 71% given using 10%, 5%, and 1%.​ ​ (a)   ​ ​ (b)  

• 7(10%)
• 1%
• 8(10%), 2%
• 6(10%), 3%
• 9(5%), 1%

Tags

CCSS.6.RP.A.3C

Calculate 45% of 180 using 10%, 5%, and 1%.​ ​ (a)   ​ ​ (b)   ​ (c)  

• 4(10%)= 4(4.5) =18
• 5%=2.25
• =20.25
• 3(10%)=3(4.5)=13.5, 5%=1.5, =15
• 2(10%)=2(4.5)=9, 5%=1, =10
• 5(10%)=5(4.5)=22.5, 5%=3.5, =26

Tags

CCSS.6.RP.A.3C

Calculate 15% of 220 using 10%, 5%, and 1%.​ ​ (a)   ​ ​ (b)   ​ (c)  

• 10%= 22
• 5%=11
• =33
• 10%=20, 5%=10, =30
• 10%=25, 5%=15, =40
• 10%=30, 5%=5, =35

Tags

CCSS.6.RP.A.3C