The rectangle is now split into 6 parts (sixths). To work out 4⁄5 × 3⁄8, multiply the numerators (4 x 3 = 12) and multiply the denominators (5 × 8 = 40). This gives the answer 12⁄40 ...
The method to divide fractions is to keep the first fraction the same, turn the divide sign into a multiply and turn the second fraction upside down. This is known as multiplying by the reciprocal.