Fractions

UK Primary (3-6)

Identify lowest common denominators

Find the lowest common denominator of $\frac{1}{2}$12 and $\frac{1}{7}$17.

To do this, we will look at the multiples of $2$2 and $7$7.

a

Fill in the table with the first ten multiples of $2$2.

$\times$× |
$1$1 | $2$2 | $3$3 | $4$4 | $5$5 | $6$6 | $7$7 | $8$8 | $9$9 | $10$10 |
---|---|---|---|---|---|---|---|---|---|---|

$2$2 | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ |

b

Fill in the table with the first ten multiples of $7$7.

$\times$× |
$1$1 | $2$2 | $3$3 | $4$4 | $5$5 | $6$6 | $7$7 | $8$8 | $9$9 | $10$10 |
---|---|---|---|---|---|---|---|---|---|---|

$7$7 | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ | $\editable{}$ |

c

Hence, what is the lowest common denominator of $\frac{1}{2}$12 and $\frac{1}{7}$17?

Easy

Approx 2 minutes

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