Final answer:
Anna claimed that the product of 78 x 112 is 72, which is incorrect because by estimating, 78 x 100 gives 7800, which is already far greater than 72, indicating the product she stated is too small.
Step-by-step explanation:
To determine if Anna's statement that the product of 78·112 equals 72 is correct or not, we need to first check the reasonableness of her answer. By quickly estimating, 78·100 would give 7800, which is already significantly larger than 72. Therefore, the correct statement would be that the product is too small. Even if we don't perform the exact multiplication, we can see that the provided product does not seem reasonable given the size of the numbers involved.
Without actual calculation, using estimation, we expect the product to be much larger since 112 is greater than 100 and the multiplication of 78 by 100 already gives 7800. Thus, Anna's claim that 78·112 equals 72 is incorrect because the product she provided is way too small to be the true product of the numbers given.