The given table shows the quantities of some ingredients used to bake a cake. What is the total weight of the ingredients as a mixed number?
And we’ve got nought point five five pounds of flour, nought point four five pounds of milk, nought point three five pounds of sugar, and naught point one five pounds of butter. Now we’ve got to add up all those weights and then convert our answer to a mixed number. Now I’m quite happy adding with decimal numbers, so that’s what I’m gonna do to calculate the total weight.
And to calculate the total weight, we could do this as a column addition. So just writing in all of our numbers like this, we’ve got five plus five plus five plus five is twenty. So that’s zero in the unit’s column carry two. And then in the next column, we’ve got five plus four is nine plus three is twelve plus one is thirteen plus two is fifteen. So that’s a five in that column carry one. And then we’ve got zero plus zero plus zero plus zero plus one is one. So the answer is one point five zero pounds or one point five pounds.
But another quick mental method for doing that is to notice that nought point five five and nought point four five added together make one whole one. And nought point three five and nought point one five added together make nought point five. So we could have spotted quite easily one plus nought point five is equal to one point five.
Anyway, whichever method you do it is not a problem. We’ve got our answer, one point five, but we’ve got to convert that to a mixed number. Well one point five is one whole number plus nought point five, a half of a whole number. So that’s gonna be one plus a half, which is equal to one and a half. So our answer is gonna be one and a half pounds.