XIII.Multiply Decimals
To multiply a decimalby a whole number or another decimal:
- Multiply as you would with whole numbers.
- Count the number of decimal places in both factors.
- Mark off the samenumber of decimal places in the product.
Multiply: 11 0.31
Estimate: 10 0.3 3
Compute:
618 3 3 9 0 4 ,
5 4 R532
3090
3004
2472
532
XII.Divide Whole Numbers
To divide by a 1-digit number, you can use short division.
- Divide to find the first digit of the quotient.
- Multiply and subtract mentally.
- Write each remainder in front of the next digit in
the dividend. - Repeat the steps until the division is completed.
To divide by a 2- or 3-digit number:
- Decide where to begin the quotient. If there are not enough hundreds,
the quotient begins in the tens place. Divide the tens and ones.
Find the quotient: 33,904 618
Practice Exercises
412 Skills Update
8
8056
64448 ,^44
2 decimal places
Divide: 64,448 8
Estimate: 64,000 8 8000
Compute:
600 36000 ,
60 estimated quotient
0.31
11
31
31
3.41
2 decimal places
5 decimal places
3 decimal places
Find the product: 0.42 0.329
Estimate: 0.4 0.3 0.12
Compute: 0.329
0.42
658
1316
0.13818
Sometimes you will need to write
one or more zeros in the product.
2 decimal places
5 decimal places
0.425 3 decimal places
0.02
0.00 850