OA.2 Lesson

OA.2 Lesson

I can write numerical expressions.

Vocabulary

Numerical Expression: a mathematical sentence involving numbers and operations

Sum: the answer to an addition problem

Difference: the answer to a subtraction problem

Product: the answer to a multiplication problem

Quotient: the answer to a division problem

Multiple Select

Which shows how to find the product of 5 and 4?

• $$5\times4$$

• $$5+4$$

• $$5-4$$

• $$5\div4$$

Multiple Select

Which shows how to find the difference between 18 and 3?

• $$18\times3$$

• $$18+3$$

• $$18-3$$

• $$18\div3$$

Multiple Select

Which shows how to find the sum of 9 and 7?

• $$9\times7$$

• $$9+7$$

• $$9-7$$

• $$9\div7$$

Multiple Select

Which shows how to find the quotient of 20 and 4?

• $$20\times4$$

• $$20+4$$

• $$20-4$$

• $$20\div4$$

More Than One Step

Most numerical expressions involve more than one step. Let's make this a little more challenging!

Multiple Choice

seven less than the product of 12 and 18

• (12 x 18) -7

• 7 - (12 x 18)

• 12 x (18 - 17)

• 7 x (12 - 18)

Multiple Select

subtract 24 from 28 and then divide by 2

• $$\left(24-28\right)\div2$$

• $$2\div\left(28-24\right)$$

• $$\left(24\div2\right)-\left(28\div2\right)$$

• $$\left(28-24\right)\div2$$

Multiple Select

the quotient of 4 and 2 multiplied by 5

• $$\left(4+2\right)\times5$$

• $$\left(4\times2\right)\times5$$

• $$\left(4-2\right)\times5$$

• 
  

  $$\left(4\div2\right)\times5$$
  

Multiple Select

multiply the sum of 150 and 140 by 8

• $$\left(150+140\right)\times8$$

• $$\left(150\times140\right)+8$$

• $$\left(150\times140\right)\times8$$

• $$8\times\left(150-140\right)$$

Word Problems

Some word problems can be written out as numerical expressions to solve. Let's practice. : )

Multiple Select

Jill got 32 pieces of candy for Halloween. She ate 8 pieces and then split the rest evenly into 4 bags. Which numerical expression shows how to find how many pieces went in each bag?

• $$\left(32+8\right)\div4$$

• $$\left(32-8\right)\div4$$

• $$\left(32-8\right)\times4$$

• $$\left(32\times8\right)-4$$

Multiple Select

For her birthday Hannah got $20 from her Nana and $15 from her Papaw. She adds this to the $5 she already has in her piggy bank. Which numerical expression can she use to find how much money she has now?

• $$\left(20-15\right)+5$$

• $$\left(20+15\right)\times5$$

• $$\left(20+15\right)-5$$

• $$\left(20+15\right)+5$$

Multiple Select

Rita has a piece of ribbon that is 20 inches long. She cuts the ribbon into 5 equal pieces. Then, she cuts off 2 more inches. Which numerical expression matches the situation?

• $$\left(20-5\right)-2$$

• $$\left(20\div5\right)-2$$

• $$\left(20\times5\right)-2$$

• $$\left(20\div5\right)+2$$

Multiple Select

Will is at the beach. He collected 20 shells yesterday and 17 today. On his way home today 3 shells fell out of his pocket. Which numerical expression shows how many shells he has altogether?

• $$\left(20+17\right)-3$$

• $$\left(20-17\right)-3$$

• $$\left(20+17\right)\times3$$

• $$\left(20+17\right)\div3$$

Open Ended

What has to be broken before you can use it?