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Equations and Mental Math
Con il contributo di: Champagne
1.  y-8=4
What number minus 8 is 4?

2.  10x=90
10 times a number is 90.

3.  n÷4=7
What number divided by 4 is 7?

4.  y+2=2
What number plus 2 equals 2?
X=
y=
n=
y=
Solve the equation using mental math.

5.  x + 10 = 24                  x=

6.  13n = 13                      n=

7.  35y = 0                        y=

8.  y - 6 = 11                     y=
Tell whether 5 is a solution to each equation.
Write yes or no in blank.

9.  t+2=7

10.  16 - k = 11

11.  15 ÷ m = 5

12.  4y=20
13.  You are saving money to buy a phone that costs
$195.  So far, you have saved $87.  If you save 
$9 per week from this point, how many weeks
will it take to have exactly $195?

14.  You make $7/hour babysitting.  You need
to earn $420.  How many hours do you need to 
babysit to earn $420?

15.  You know that 717 adults and 489 children
went to the fair.  Estimate to the nearest
hundred the total number of people that went
to the fair.
No comma in answer.
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