INDEX
13, 14 and 15 times tables
A
addition
—breakdown of numbers
—order of addition
C
calculators
—beating
casting out nines
see checking answers
substitute numbers
checking answers
—any size number
—casting twos, tens and fives
—for division
—shortcut for
—substitute numbers
—why it works
combining methods
D
decimals
—rounding off
divisibility of numbers
division
—by 9 (shortcut)
—by numbers ending in
—changing to multiplication
—direct long division
—estimating answers
—larger numbers
—long division by factors
—long division made easy
—rounding upwards
—smaller numbers
—using circles
—with decimals
doubling numbers
E
estimating