How_To_Be_Good_At_Math
CALCULATING • PARTITIONING FOR DIVISION 139 Imagine you’re going on holiday in 291 days and you want to know how many weeks you ...
140 CALCULATING •^ EXPANDED SHORT DIVISION Expanded short division Short division is a method we use when the number we are divi ...
CALCULATING • EXPANDED SHORT DIVISION 141 The last step is to add up how many 7s we’ve taken away. That’s why we wrote them down ...
142 CALCULATING •^ SHORT DIVISION Short division Short division is another method for working out division calculations on paper ...
CALCULATING • SHORT DIVISION 143 Now look at the ones column. Because we carried over the 1 from the tens column, we divide 16 b ...
144 CALCULATING •^ EXPANDED LONG DIVISION Expanded long division When the number we are dividing by (the divisor) has more than ...
CALCULATING • EXPANDED LONG DIVISION 145 4728 ÷ 34 = 139 r2 Finally, let’s add up how many 34s we took away, which we listed bes ...
146 CALCULATING •^ LONG DIVISION Long division In expanded long division (see pages 144-45), we divide by subtracting multiples ...
CALCULATING • LONG DIVISION 147 4728 ÷ 34 = 139 r2 Bring down the 8 to sit next to the result of the subtraction Now divide 308 ...
148 CALCULATING •^ CONVERTING REMAINDERS Converting remainders We can convert the remainder in the answer to a division calculat ...
CALCULATING • CONVERTING REMAINDERS 149 To turn this remainder 3 into a decimal, continue calculating. Place a decimal point at ...
150 CALCULATING •^ DIVIDING WITH DECIMALS Dividing with decimals Dividing a number by a decimal number or dividing a decimal num ...
CALCULATING • DIVIDING WITH DECIMALS 151 Let’s divide 1.24 by 4. 1.24 ÷ 4 =? You’ll need place value columns for decimal places ...
152 CALCULATING •^ THE ORDER OF OPERATIONS The order of operations Some calculations are more complex than just two numbers with ...
CALCULATING • THE ORDER OF OPERATIONS 153 BODMAS stands for: Brackets Orders Division Multiplication Addition Subtraction Now we ...
Arithmetic laws Whenever we’re calculating, it helps to remember three basic rules called the arithmetic laws. These are especia ...
We can break 15 into its factors 5 and 3. If we then work out this calculation, the answer is 90. The associative law allows us ...
156 CALCULATING •^ USING A CALCULATOR Using a calculator A calculator is a machine that can help us to work out the answers to c ...
CALCULATING • USING A CALCULATOR 157 Calculator questions Now that you know all of the important keys on the calculator and how ...
158_159_Chapter_3.indd 158 29/02/2016 16:39 ...
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