Multiplication Table for 2, 3, 4 and 5
Suppose you want to multiply 25.3 by 0.46.
Pretend that you’re multiplying numbers without decimal points:
Now you need to find out where the decimal point goes.
To do this, notice that 25.3 has one digit after the decimal point, and that 0.46 has two digits after the decimal point.
Place the decimal point in the answer so that it has three digits after the decimal point.
Suppose you want to add the fractions 3⁄7 and 4⁄5.
To get the numerator of the answer, cross-multiply. In other words, multiply the numerator of each fraction by the denominator of the other. Continue reading Adding fractions with unlike denominators
Suppose you want to add 12.96, 3.5 and 8.
Line up the decimal points.
Begin adding from the right-hand column. Treat the blank spaces after 3.5 and 8 as zeroes.
Add first column.
Continue to the left.
Complete the problem column by column, and at the end, put the decimal point directly below the others. Continue reading Adding Decimals
Suppose you want to find 45 divided by 3.
Start off by writing the problem like this.
To begin, ask how many times 3 goes into 4 — that is, what’s 4 divided by 3? Continue reading Dividing Integers
Suppose you want to subtract 83 – 56.
Begin subtracting in the ones column: 3 – 6.
Because 3 is smaller than 6, you need to borrow from the tens column.
Subtract 1 from the 8 replacing 8 with a 7.
Continue reading Subtracting Integers