How_To_Be_Good_At_Math
CALCULATING • ADDITION 79 Adding as counting on There is another way to think about addition. To add one number to another, we c ...
80 CALCULATING •^ ADDING WITH A NUMBER LINE Adding with a number line Doing calculations in your head can be tricky. We can use ...
CALCULATING • ADDING WITH A NUMBER GRID 81 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 3 ...
82 CALCULATING •^ ADDITION FACTS Compare this fact with the last one This is like the first fact – the numbers are just in a dif ...
CALCULATING • PARTITIONING FOR ADDITION 83 (^80) + 54 Partitioning for addition Adding numbers is often easier if you split them ...
84 CALCULATING •^ EXPANDED COLUMN ADDITION Expanded Column addition To add together numbers that have more than two digits, we c ...
CALCULATING • EXPANDED COLUMN ADDITION 85 When we add together the 8 and 5, we’re actually adding 80 and 50. The answer is 130. ...
86 CALCULATING •^ COLUMN ADDITION Shopkeeper’s addition Now we're going to look at another method of column addition. This is qu ...
CALCULATING • COLUMN ADDITION 87 First, write the larger number above the smaller number, making sure to line up the decimal poi ...
88 CALCULATING •^ SUBTRACTION Subtraction Subtraction is the opposite, or the inverse, of addition. There are two main ways we c ...
CALCULATING • SUBTRACTION 89 Subtracting as finding the difference We can also think of subtraction as finding the difference be ...
90 CALCULATING •^ SUBTRACTION FACTS Subtraction facts There are some simple facts that you can learn for subtraction to make tri ...
Partitioning for subtraction Partitioning for subtraction Subtracting numbers is often simpler if you split them into numbers th ...
92 CALCULATING •^ SUBTRACTING WITH A NUMBER LINE When you use a number line for subtraction, it doesn’t matter if you count down ...
CALCULATING • SHOPKEEPER’S ADDITION 93 Shopkeeper’s addition People who work in shops often need to work out quickly how much ch ...
94 CALCULATING •^ EXPANDED COLUMN SUBTRACTION Expanded Column subtraction............... To find the difference between numbers ...
CALCULATING • EXPANDED COLUMN SUBTRACTION 95 H T Now we just need to add the 24 that will take the total from 300 to 324. Write ...
96 CALCULATING •^ COLUMN SUBTRACTION Column subtraction Using column subtraction is an even quicker way of subtracting large num ...
CALCULATING • COLUMN SUBTRACTION 97 Now we can subtract 6 tens from 12 tens. The answer is 6 tens. Write the 6 in the tens colum ...
98 CALCULATING •^ MULTIPLICATION Multiplication There are two main ways to think about how multiplication works. We can think of ...
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