How about trying this 'Mastery' activity in Maths....?
Did you know
that if you double the last digit and subtract it from the number left by the
remaining digits and if that equals 0 or is divisible by 7 then your starting
number is a multiple of 7! E.g. 672; 67
- 4 = 63 which is divisible by 7 so therefore 672 is a multiple of 7. Challenge children to establish rules for
finding multiples of numbers from 2 to 10.
A number is a
multiple of:
2 if the
last digit is even (0, 2, 4, 6, 8).
3 if the sum
of the digits is divisible by 3.
4 if the
last 2 digits are divisible by 4.
5 if the
last digit is 0 or 5.
6 if the
number is divisible by 2 (i.e. even) AND 3 (i.e. sum of digits is divisible by
3).
7 if you
double the last digit and subtract it from the number made by the rest of the
remaining digits and it equals 0 or is divisible by 7 e.g. 672; 67 - 4 = 63
which is divisible by 7.
8 if the
last 3 digits are divisible by 8
9 if the sum
of the digits is divisible by 9
10
if the number ends in a 0.
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