So I said I had a trick for you to help you get the hang of the four times table. I thought it would be an entirely new and exciting trick but in fact I heard you doing it yourself the other day. It's the doubling trick. The doubling trick The doubling trick Haha Get it? Get it? Anyway. Here's two things I know you are really good at: The two times table Doubling things And of course, if you double the two times table you get the four times table. 2x1=2 4x1=4 2x2=4 4x2=8 2x3=6 4x3=12 2x4=8 4x4=16 2x5=10 4x5=20 2x6=12 4x6=24 2x7=14 4x7=28 2x8=16 4x8=32 2x9=18 4x9=36 2x10=20 4x10=40 2x11=22 4x11=44 2x12=24 4x12=48 But maybe that gets a bit blurry after the five times table here's another way you could do it. Here's another way to use doubling. With my other helpful hints you can learn the entire four times table. 1x4 = 4 - you already know the 1 times table silly 2x4 = 8 - and you already know the 2 times table 3x4 = 12 - you know the 3 times table tooooooooo 4x4 = 16 - you just need to double 2x4 (because 4 is double 2) 4x5 = 20 - you actually already know this but it's double 2x5 4x6 = 24 - just double 4x3 (because 6 is double 3) 4x7 = 28 - well just add 4 on to 24 4x8 = 32 - just double 4x4 (because 8 is double 4) 4x9 = 36 - just add 4 on to 32 4x10 = 40 - um you know this already 4x11 = 44 - and add another 4 on 4x12 = 48 - and another 4 again. YOU ARE DONE - marvelous! Here is a really good bit of doubling that is in a play called Macbeth by William Shakespeare. It is right at the beginning of the play. SCENE I. A cavern. In the middle, a boiling cauldron. Thunder. Enter the three Witches First Witch Thrice the brinded cat hath mew'd. Second Witch Thrice and once the hedge-pig whined. Third Witch Harpier cries 'Tis time, 'tis time. First Witch Round about the cauldron go; In the poison'd entrails throw. Toad, that under cold stone Days and nights has thirty-one Swelter'd venom sleeping got, Boil thou first i' the charmed pot. ALL Double, double toil and trouble; Fire burn, and cauldron bubble. Second Witch Fillet of a fenny snake, In the cauldron boil and bake; Eye of newt and toe of frog, Wool of bat and tongue of dog, Adder's fork and blind-worm's sting, Lizard's leg and owlet's wing, For a charm of powerful trouble, Like a hell-broth boil and bubble. ALL Double, double toil and trouble; Fire burn and cauldron bubble. Third Witch Scale of dragon, tooth of wolf, Witches' mummy, maw and gulf Of the ravin'd salt-sea shark, Root of hemlock digg'd i' the dark, Liver of blaspheming Jew, Gall of goat, and slips of yew Silver'd in the moon's eclipse, Nose of Turk and Tartar's lips, Finger of birth-strangled babe Ditch-deliver'd by a drab, Make the gruel thick and slab: Add thereto a tiger's chaudron, For the ingredients of our cauldron. ALL Double, double toil and trouble; Fire burn and cauldron bubble. Second Witch Cool it with a baboon's blood, Then the charm is firm and good.
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