How_To_Be_Good_At_Math
CALCULATING • EXPANDED LONG MULTIPLICATION 119 First, multiply 7 ones by 1 ten. The answer is 7 tens, or 70. On another new line ...
120 CALCULATING •^ LONG MULTIPLICATION Long multiplication Now we’re going to look at another method of long multiplication (whi ...
CALCULATING • LONG MULTIPLICATION 121 Now multiply 6 ones by 4 tens. The answer is 24 tens. Write the 4 in the tens column and c ...
122 CALCULATING •^ MORE LONG MULTIPLICATION More long multiplication When we need to multiply a number that has more than two di ...
CALCULATING • MORE LONG MULTIPLICATION 123 Next, multiply 7 thousands by 3 ones. The answer is 21 thousands. Write 1 in the thou ...
124 × × × × CALCULATING • MULTIPLYING DECIMALS We can use long multiplication to multiply decimals. It might look tricky, but re ...
125 × × × × × CALCULATING • MULTIPLYING DECIMALS We’ll multiply each digit on the top row by 5 Write a decimal point on a new li ...
126 CALCULATING •^ THE LATTICE METHOD The lattice method There are several ways to do multiplication calculations, as you have s ...
CALCULATING • THE LATTICE METHOD 127 We can use the lattice method to multiply decimals, too. We just need to find where the dec ...
128 CALCULATING •^ DIVISION Division Division is splitting a number into equal parts, or finding out how many times one number f ...
CALCULATING • DIVISION 129 Division is repeated subtraction Division is also like taking away one number from another number aga ...
130 CALCULATING •^ DIVIDING WITH MULTIPLES Dividing with multiples We’ve already used number lines to add, subract, and multiply ...
CALCULATING • THE DIVISION GRID 131 The division grid We can take the multiplication grid (see page 106) and use it as a divisio ...
132 CALCULATING •^ DIVISION TABLES 4 ÷ table 5 ÷ table 6 ÷ table 1 ÷ table 2 ÷ table 3 ÷ table 1 ÷ 1 = 1 2 ÷ 1 = 2 3 ÷ 1 = 3 4 ÷ ...
CALCULATING • DIVISION TABLES 133 10 ÷ table 11 ÷ table 12 ÷ table 7 ÷ table 8 ÷ table 9 ÷ table 10 ÷ 10 = 1 20 ÷ 10 = 2 30 ÷ 10 ...
134 CALCULATING •^ DIVIDING WITH FACTOR PAIRS Dividing with factor pairs You’ll remember that a factor pair is two numbers that ...
CALCULATING • CHECKING FOR DIVISIBILITY 135 Checking for divisibility A simple calculation or an observation about a number will ...
and Dividing by 10, 100, Dividing by 10, 100, and 1000 Dividing by 10 is simple: you just shift the digits one place to the righ ...
CALCULATING • DIVIDING BY MULTIPLES OF 10 137 Dividing by multiples of 10 If your divisor (the number you’re dividing by) is a m ...
138 CALCULATING •^ PARTITIONING FOR DIVISION Partitioning for division When you’re dividing a number with two or more digits, it ...
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