Fred and Frog are in year four.
They need to know their five times table. "First," says Fred, "We have
to count by fives." "Oh, that's easy," says Frog.
"I can do that." "Of course you can. So can
I," says Fred. They count: Twenty five, thirty, thirty five, forty, forty five, fifty!" Here are the numerals instead
of the words: 5,10,15,20 25, 30, 35, 40, 45, 50! Once five is five, and two
fives are ten." Frog went on: "Three fives
are fifteen and four fives are twenty." Fred's turn: "Five fives are
twenty five and six fives are thirty." They said the rest together:
"Seven fives are thirty five, Eight fives are forty, nine
fives are forty five - And ten fives are fifty!" 1 x 5 = 5 "Hey, yeah!" cried Fred. "Every
answer ends in a five or a zero." "That's right," agreed Frog.
He stared at the numerals again
and grinned. "If it's an odd number times five, it ends in a five." "And if it's an even number
times five it ends in a zero," Fred cried. "That's going to help me remember
my five times table." You can find them and count
by fives too. They read through their five
times table again. You can find it and read through
it too. Remember every answer ends
in a five or a zero! Now they are jumbled up. Be
careful! and eight times and nine times
as well," Fred told Frog. "How come?" asked Frog "Well, look! I know that 5
x 6 is the same as 6 x 5, so if 6 x 5 = 30, then 5 x
6 = 30, too!" "Oh yeah," agreed Frog. "That's
right. So 7 x 5 = 35, and 5 x 7 = 35 as well." 9 x 5 = 45, and 5 x 9 = 45.
Hey, we didn't just learn our
fives, we learned some of the other tables as well." Fred and Frog were very pleased
with themselves. They counted by fives again.
Count with them: 5, 10, 15, 20, 25, 30, 35,
40, 45, 50 - 55, 60! That's 11 x 5 and 12 x 5 as
well!!
"Five, ten, fifteen, twenty
This time can you count with them?
"All right then," cried Fred. "I'll go first!
"We should write that in numerals," said Fred. So they wrote it:
2 x 5 = 10
3 x 5 = 15
4 x 5 = 20
5 x 5 = 25
6 x 5 = 30
7 x 5 = 35
8 x 5 = 40
9 x 5 = 45
10 x 5 = 50
"Wow! Look!" said Frog. Look at all the fives and zeroes!
Fred and Frog counted by fives again.
2 x 5 =
1 x 5 =
4 x 5 =
3 x 5 =
6 x 5 =
5 x 5 =
8 x 5 =
7 x 5 =
10 x 5 =
9 x 5 =
3 x 5 =
6 x 5 =
2 x 5 =
5 x 5 =
8 x 5 =
1 x 5 =
10 x 5 =
4 x 5 =
9 x 5 =
"We know some of our six times and seven times
"Yes! And 8 x 5 = 40 and 5 x 8 = 40 too.