Arithmetic - Decimals

Question 1

decimals

Answer 1

a collection of digits after a period is called a decimal fraction

Example: 0.609 = 609/10x10x10 = 609/1000

Question 2

adding decimals

Answer 2

Line the decimals up:
1.452
+1.3

“Pad” with zeros:
1.452
+1.300

Add:
1.452
+1.300
2.752

Question 3

subtracting decimals

Answer 3

Line the decimals up:

7. 368
   - 1.15

“Pad” with zeros:

7. 368
   - 1.150

Subtract:

7. 368
   - 1.150
8. 218

Question 4

multiplying decimals

Answer 4

Multiply normally, ignoring the decimal points.
Then put the decimal point in the answer - it will have as many decimal places as the two original numbers combined.

	0.03 × 1.1
multiply without decimal points:
 	3 × 11 = 33
add the three decimal places back in
        0.033