Addend+Addend=Sum
Minuend-Subtrahend=Difference
Factor+Factor=Product
Dividend/Divisor=Quotient
10x1000=10 000 0.1x1000=100
10x100=1 000 0.1x100=10
10x10=100 0.1x10=1
10x1=10 0.1x1=0.1
10x0.1=1 0.1x0.1=0.01
10x0.01=0.1 0.1x0.01=0.001
10x0.001=0.01 0.1x0.001=0.0001
10x0.0001=0.001 0.1x0.0001=0.00001
A good way to multiply hard decimals is:
121 1.21
x13 x1.3
----- ------
363 1.573
1210
-------
1573
A rule for multiplying decimals could be: Add how many decimal places are in each factor to get the decimal place value in the product.
Examples:
1 + 1 = 2
0.2x0.2=0.04
3 + 3 = 6
0.111x0.1111=0.012321
4 + 4 = 8
0.1111x0.1111=0000.01234321
100/10=10 0.001/0.1=0.01
10/10=1 0.01/0.1=0.1
1/10=0.1 0.1/0.1=1
0.1/10=0.01 1/0.1=10
0.01/10=0.001 10/0.1=100
0.001/10=0.0001 100/0.1=1 000
A rule for dividing decimals could be: Subtract how many decimal places are in the dividend and divisor to get the decimal place value in the quotient.
Examples:
2 - 1 = 1
0.02/0.4=0.5
2 - 3 = -1
0.02/0.006=3.33..
Homework!
-Finish all 2.2 worksheets
-Homework Book
-Math Textbook;leftover work
