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Lesson 11: Using Mental Math



 1. 

Use mental math to add.
     $10.99 + $7.01
a.
$17.00
b.
$18.00
c.
$19.00
d.
$20.00
 

 2. 

Use mental math to add.
     $13.49 + $12. 51
a.
$24.00
b.
$25.00
c.
$26.00
d.
$27.00
 

 3. 

Use mental math to add.
     $35.00 + $32.75
a.
$57.75
b.
$67.75
c.
$77.75
d.
$8775
 

 4. 

Use mental math to subtract.
     $35.00 - $32.80
a.
$2.20
b.
$5.80
c.
$2.80
d.
$4.20
 

 5. 

Use mental math to subtract.
     $7.99 - $4.99
a.
$2.00
b.
$3.00
c.
$4.00
d.
$5.00
 

 6. 

Use mental math to subtract.
     $15.00 - $13.45
a.
$1.45
b.
$2.45
c.
$1.55
d.
$2.55
 

 7. 

Andrea spent $5.60 on socks and $39.50 on a shirt. How much money did Andrea spend altogether?
a.
$45.00
b.
$45.05
c.
$45.10
d.
$45.20
 

 8. 

If Andrea paid with a $50.00 bill, how much change did she get back?
a.
$5.00
b.
$5.10
c.
$4.00
d.
$4.90
 

 9. 

Fred had a $20.00 gift certificate to spend at the Snack Shop. How much will it cost Fred if he bought a hotdog for $2.99 and a pop for $1.25?
a.
$4.00
b.
$4.24
c.
$5.00
d.
$5.24
 

 10. 

How much change will Fred get back if he used his gift certificate?
a.
$15.76
b.
$15.00
c.
$16.26
d.
$16.00
 



 
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