How_To_Be_Good_At_Math
99 It doesn't matter which order you multiply numbers in the total will be the same. CALCULATING • MULTIPLICATION Multiplicati ...
100 Scaling and fractions As we’ve just seen, we can also scale with fractions. Multiplying withproper fractions, which are frac ...
CALCULATING • FACTOR PAIRS 101 Factor pairs Two whole numbers that are multiplied together to make a third number are called fac ...
102 CALCULATING •^ COUNTING IN MULTIPLES Counting in multiples When a whole number is multiplied by another whole number, the re ...
CALCULATING • COUNTING IN MULTIPLES 103 We can keep counting in multiples forever Add 8 each time Add 3 each time The multiplica ...
104 CALCULATING •^ MULTIPLICATION TABLES CALCULATING •^ MULTIPLICATION TABLES 4 × table 5 × table 6 × table 1 × table 2 × table ...
CALCULATING • MULTIPLICATION TABLES CALCULATING • MULTIPLICATION TABLES 105 10 × table 11 × table 12 × table 7 × table 8 × table ...
106 CALCULATING •^ THE MULTIPLICATION GRID CALCULATING •^ MULTIPLICATION PATTERNS AND STRATEGIES The multiplication grid We can ...
CALCULATING • THE MULTIPLICATION GRID CALCULATING • MULTIPLICATION PATTERNS AND STRATEGIES 107 Multiplication patterns and strat ...
108 CALCULATING •^ MULTIPLYING BY 10, 100, AND 1000 Multiplying by 10, 100, and 1000 Multiplying by 10, 100, and 1000 is straigh ...
CALCULATING • MULTIPLYING BY MULTIPLES OF 10 109 Multiplying by multiples of 10 To make multiplication calculations involving mu ...
110 CALCULATING •^ PARTITIONING FOR MULTIPLICATION Partitioning for multiplication Just like we do for addition, subtraction, an ...
CALCULATING • PARTITIONING FOR MULTIPLICATION 111 Partitioning on a grid We can also use a grid to help us to partition for mult ...
112 CALCULATING •^ THE GRID METHOD We can also use a slightly different version of the open array we saw on page 111. We call it ...
CALCULATING • THE GRID METHOD 113 So, 37 × 18 = 666 Finally, we simply add up all the numbers in the grid row by row and write t ...
114 CALCULATING •^ EXPANDED SHORT MULTIPLICATION Expanded short multiplication When one of the numbers in a multiplication calcu ...
CALCULATING • EXPANDED SHORT MULTIPLICATION 115 As you multiply numbers with more digits, you'll need to add extra rows to your ...
116 CALCULATING •^ SHORT MULTIPLICATION Short multiplication Now we’re going to look at another method of short multiplication. ...
CALCULATING • SHORT MULTIPLICATION 117 So, 736 × 4 = 2944 Next, we multiply 3 tens by 4 ones. The answer is 12 tens. Add on the ...
118 CALCULATING •^ EXPANDED LONG MULTIPLICATION Expanded long multiplication When we need to multiply two numbers that both have ...
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