SUBTRACT WHOLE NUMBERS
SUBTRACT DECIMALS

PROBLEMS

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 1 1. Subtraction by adding to both numbers.
824
− 358
466

1.  .  a)   How do we compensate for adding 10 ones to 4 ones?

Add 1 ten to 5 tens.

1.  .  b)   Why does that compensate?

Because 1 ten is equal to 10 ones. And if we add the same number to both the larger and the smaller, their difference does not change.

1.  .  b)   How do we compensate for adding 10 tens to 2 tens on top?

Add 1 hundred to 3 hundreds on the bottom.

1.  .  b)   Why does that compensate?

Because 1 hundred is equal to 10 tens.

12.   What do we obtain if we add the Difference and the Smaller
12.   number?

Larger
− Smaller
Difference

The Larger number.

13.   Subtract.

14.     a)   9238             b)   3420               c)   6806               d)   5000
13.   a) - 2564             b) - 2514               c) - 1739               d) - 3614
13.   6674 906 5067 1386
13.     e)   90.02            f)   43.21               g)   4026.09           h)   90.00
13.   e)  -94.56            f) - 12.34                g) -  280.60            h) -  9.92
13.   85.46 30.87 3745.49 80.08

14.  Alignment

a)  7.02 − 5.68 = 1.34   b)  19.68 − 4 = 15.68
 
c)  2 − .036 = 1.964   d)  23.1 − 4 = 19.1
 
e)  786.5 − .042 = 786.458   f)  15 − 2.048 = 12.952
 
g)  6 − 3.79 = 2.21   h)  8.756 − 3 = 5.756
 
i)  .0974 − .0069 = .0905    

15.  Subtract  6.53  from  22.1.   15.57

16.  What number must you add to one thousand nine to get five
10.  thousand six hundred twelve?

5,612 − 1009 = 4,603

17.  Richard bought a pen for $1.80, a book for $8.50, and he paid with a
17. $20 bill.  How much was his change?  $9.70

18.  Janet paid $1,025 for her car, and she sold it for $1,220.  How much
18.  was her profit?   $195

19.  At the beginning of a car trip, the odometer read 59,872.  At the end
19.  of the trip, it read 60,135.  How many miles was the trip?

60,135 − 59,872 = 263 miles

10.  Your checking account has a balance of $241.73, and you write a
10.  check for $42.95.  Then you deposit $57.69, and you write another
10.  check for $85.48.  What is your present balance?   $170.99


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