How_To_Be_Good_At_Math
NUMBERS • POSITIVE AND NEGATIVE NUMBERS 19 Ups and downs We sometimes use positive and negative numbers to describe the floors i ...
20 NUMBERS •^ COMPARING NUMBERS Comparing numbers We often need to know if a number is the same as, smaller than, or larger than ...
NUMBERS • COMPARING NUMBERS 21 TRY IT OUT Answers on page 319 Using symbols to compare numbers We use these signs, called compar ...
22 NUMBERS •^ ORDERING NUMBERS Ordering numbers Sometimes we need to compare a whole series of numbers so that we can put them i ...
NUMBERS • ORDERING NUMBERS 23 Ascending and descending order When we put things in order, sometimes we want to put the largest n ...
24 NUMBERS •^ ESTIMATING Approximately equal Quick counting In everyday life, we often don’t need to count something exactly. It ...
NUMBERS • ESTIMATING 25 Estimating a total Sometimes we estimate because it would take too long to count or calculate the exact ...
26 NUMBERS •^ ROUNDING Rounding Rounding means changing a number to another number that is close to it in value, but is easier t ...
NUMBERS • ROUNDING 27 Rounding to different place values Rounding to different place values will give us different results. Let’ ...
28 NUMBERS •^ FACTORS Factors A factor is a whole number that can be divided or shared into another number. Every number has at ...
NUMBERS • FACTORS 29 Next, we test whether 2 is a factor and find that 2 × 15 = 30. So, 2 and 15 are factors of 30. We put 2 jus ...
30 NUMBERS •^ MULTIPLES Multiples When two whole numbers are multiplied together, we call the result a multiple of the two numbe ...
NUMBERS • MULTIPLES 31 Here’s a way of finding the lowest common multiple of three numbers. Finding the lowest common multiple M ...
32 NUMBERS •^ PRIME NUMBERS Prime numbers A prime number is a whole number greater than 1 that can’t be divided by another whole ...
NUMBERS • PRIME NUMBERS 33 Prime numbers up to 100 This table shows all the prime numbers from 1 to 100. Prime numbers are shade ...
34 NUMBERS •^ PRIME FACTORS Prime factors A factor of a whole number that is also a prime number is called a prime factor. One o ...
NUMBERS • PRIME FACTORS 35 Different tree, same answer There are often lots of ways to make a factor tree. Here’s another tree f ...
36 NUMBERS •^ SQUARE NUMBERS Square numbers When we multiply a whole number by itself, the result is a square number. Square num ...
NUMBERS • SQUARE NUMBERS 37 Squares table The square numbers form a diagonal line within the grid Squares of even numbers are al ...
38 NUMBERS •^ SQUARE ROOTS A square root is a number that you multiply by itself once to get a particular square number. The sym ...
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