SUBTRACT WHOLE NUMBERS
SUBTRACT DECIMALS

PROBLEMS

Do the problem yourself first!

 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

Continue on to the next Lesson.

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