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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