SJ 6.6 lesson

SJ 6.6 lesson

Common fractions: Adding mixed numbers (unrelated denominators)

Directions

Look at this diagram and choose two numbers to mentally add together.

Be prepared to share the numbers you chose and how you calculated your sum.

Question

What do you notice about all the mixed numbers?

Question

If we chose the mixed numbers 4 1/3 and 3 3/6, would we have to change one of the fractions or both? Why?

Question

Look at this word problem.

Which two fractions would we need to remember in order to solve the problem?

Answer

1 1/4 (sugar) and 1 1/3 (flour).

The question is asking how many dry ingredients Mana has.

Milk is not a dry ingredient, so we don't need to know the amount of milk.

Question

What equation could we write to solve this problem?

Answer

1 1/3 + 1 1/4 = ?

Math notebook

Solve the equation 1 1/3 + 1 1/4 = ? in your math notebook.

Solve the problem using mixed numbers AND improper fractions.

Make sure you change the fractions before you calculate the sum.

Answer

Answer using mixed numbers is 2 7/12

Answer

The answer using improper fractions is 31/12