Question

Dr. O is playing in her garden again. She needs 1 kg of potting soil for her plants. She has 750 g. How much more does she need?

Answer 1

She needs 250 g.

Explanation:

First we have to calculate all given values i the same units. I choose grams, but it is also good if you choose kilograms.

`1kg=1000g`

So we can write that Dr. O has `750g` of potting soil and needs `1000g`. To calculate the remainingg amount we have to substract the given values:

`1000g-750g=250g`

So finally we can write that Dr. O needs `250g` of potting soil.