Page 32 - Math Smart - 7

Investigate]

PAIR WORK
Squares and Roots Bingo

Each pair will need: Squares and Roots Bingo
one game board (supplied by your
teacher) □
4 0 16 49
How to play:
n
O Your teacher will write one 7 9 2 5
calculation on the board. You
need to calculate the answer. Free
12 54 Space 4 □
0 the answer appears on your
If
game board, use a pencil to cross
3 144 8 9
out the number. You may only
cross out one number at a time.
0 When your numbers have been 100 1 □ 121
crossed out in a row or column
or diagonal (your teacher will tell
you this), raise your hand and call out 'Bingo!'.
O The first pair to call out Bingo, is the winner of the game.

0 Another pair will check your answers. You can only be the winner if
you have answered correctly.

Revision

O Find the lowest common multiple of:
List:
a) 8 and 12 b) 7 and 11
a) factors of 12 c) 4 and 15 d) 13 and 12
b) first five multiples of 12 0 a) Is it possible to list the last three
c) factors of 18 multiples of 7?
d) multiples of 9 between 30 and 81
b) Give a reason for your answer.
e) factors of 17
0 Use the clues to find the mystery numbers.
2, 3 and 5 are all factors of 30. However, a) This is a square number smaller than 100.
they are not the only factors of 30. One of its factors is 9.
a) List the other factors of 30. b) This number Is between 40 and 85. It is
b) List the factors of 30 that are prime an even multiple of 9, and 24 is a factor
numbers. of it.
State whether the statements are true or c) This is an even number between 40 and
false. If false, rewrite the statement to make 80. The numbers 5, 4 and 3 are all factors
it true. of this number.
a) Any even natural number is a multiple d) This is an odd number less than 100.
of 4. It has an odd number of factors. The
b) All prime numbers are odd. sum of the two digits that make up the
c) 7 Is a multiple of 49. number is 9.
d) 1 is a multiple of every natural number. e) This is a prime number with two digits.
e) There are only two even numbers that It is smaller than 20. If you double it and
are prime numbers. subtract 9, you get a square number.

Factors, Multiples and Primes