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 Folks back in the very olden days would make marks to stand for the amounts of things.  | | | |

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Presentation on theme: " Folks back in the very olden days would make marks to stand for the amounts of things.  | | | |"— Presentation transcript:

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3  Folks back in the very olden days would make marks to stand for the amounts of things.  | | | |

4 That’s fine for a few… but when you see | | | | | | | | | | | | | | | | | | Then understanding how many you have is challenging, especially if you don’t even have names for the bigger numbers.

5  We use a system where we recycle the same ten symbols – but they’re worth more in a different position, in the same way that a ten dollar bill is worth more than a 1 dollar bill, even if the piece of paper is the same size.

6  Here’s a page that shows the numbers one through twenty-one (1-21) and pictures of bugs, in the amount each number stands for, beside them.  If this is familiar, speed on through; if not, feel free to take some time with each page.

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8  The words for 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 are: one, two, three, four, five, six, seven, eight, nine and ten.  The words for 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20 are: eleven, twelve, thirteen, fourteen, fifteen, sixteen, seventeen, eighteen, nineteen and twenty.

9  After twenty, there is a pattern to the words:  10 ten  20 twenty  30 thirty  40 forty  50 fifty  60 sixty  70 seventy  80 eighty  90 ninety  100 one hundred If the ones place has more than zero, the word is formed by using the ten's place word, a hyphen, and then the ones place word.

10  Examples are: 38 is thirty-eight 84 is eighty-four 25 is twenty-five 141 is one hundred forty-one 308 is three hundred eight 650 is six hundred fifty

11  Once we get to a hundred, we simply say how many of that bigger place we have, and then whatever is left. We don’t use and; it’s reserved for fraction parts like one *and* a half hours or one *and* three tenths of a mile.  108 is one hundred eight  441 is four hundred forty-one  980 is nine hundred eighty

12  Write these out in letters and words:

13 One hundred forty-five five hundred two three hundred eighty-three six hundred ninety-eight Sixty-one two hundred eighty five hundred fifty-one seven hundred thirty-eight

14  Six hundred twenty-five  Four hundred eighty-six  Three hundred fifty  Three hundred five  Three hundred ninety-five

15  Six hundred twenty-five 625  Four hundred eighty-six 486  Three hundred fifty 350  Three hundred five 305 (there aren’t any tens – but we have to say that with zero!)  Three hundred ninety-five 395

16  There’s lots of it here:  html html  if you prefer clicking to spelling the words out


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