Finding Unknowns
Patterns and Fractions
Multiplication Strategies
Mystery
Surprise!
100
Jessaly is solving the problem below. What is the unknown number? 7+5= nx2
n=6
100
Lewis has a pizza with 8 pieces. He eats 4 pieces of pizza. How much of the pizza is left? DRAW A PICTURE
4/8, or simplified as 1/2
100
The third graders at Valley Crest are marching in a school parade. There are 6 students in each row. There are 10 rows. Which one shows us how to find the number of students in the parade? A) (3x3) x (5+2) B) (3+3)+(5x2) C) (3+3) x (5x2) D) (3x3) + (4x5)
C) Using the Distributive Property (3+3)x(5x2) 6x10= 60 students
100
Jasmine and Cortney are working on multiplication facts. Will their next problem have an odd or even product and why? 6x5
It will be even, because one of the factors is even.
100
What fraction is located on the same point on the number line as one (as represented by the number line?)
3/3
200
Alexis needs 32 candies to share with the class. Each bag has 8 candies in it. How many bags does Alexis need? Write the multiplication problem with the unknown and solve!
8 x f = 32 f=4
200
Mrs. Sorenson's class is doing a project about animals and habitats. Each student has three books. Describe the pattern in the table. Then complete the table. (See Table #1)
15, 21
200
Draw a picture using base ten blocks for 4 x 40. Think: Four groups of forty
(Show picture)
200
Arien has 5 rolls of dimes and 5 rolls of nickels. A roll of dimes is worth $5. A roll of nickels is worth $2. How much money does he have?
5x5=25 5x2=10 25+10= $35
200
What fraction of the shapes are circles?
2/5
300
a x 40 = 480
a x 60 = 360 Simplify to basic fact: a x 6= 36 a= 6
300
Madi bought 3 pieces of chocolate. The chocolate was 1/4 of the candy she bought. How many candies did she buy?
3x4= 12 pieces of candy
300
Will and Kaleb planted 5 rows of seeds. He planted 50 seeds in each row. How many seeds did Will plant?
250 seeds
300
What are the missing numbers in the table? What is the pattern? (See table #5)
Missing numbers: 30, 48 Pattern: Multiply by 6, or add 6 each time
300
Angel likes to read fantasy books. His new book has 64 pages. He plans to read 8 pages a day. How many days will it take him to finish his book?
n x 8= 64 n= 8
400
The jump rope club plans to have 8 groups. There are 72 students who signed up to join. How many students will be on each team? Write a multiplication problem and find the unknown. Think- what is the product (It is given to you!)
8 x b = 72 b= 9
400
Molly and Lili are making cupcakes. The table describes how many sprinkles they will need. What is the pattern? See Table #2
Counting by 8, or multiply the # of cupcakes by 8
400
A bank makes 40 rolls of nickels. How many nickels would there be if Grant gets 8 rolls of nickels? Write the multiplication problem and solve.
8 x 40= 320
400
Micah has 24 pieces of pie to share with his 8 friends. How many pieces does each friend get? Write the DIVISION problem and solve!
3 pieces
400
Bukuru takes 45 minutes to take care of his pet hamster each week. He cleans the cage once a week and gets him food and water every day. He takes 10 minutes to clean the cage. How many minutes does it take him to change the water each day?
45-10= 35 k x 7= 35 k= 5 minutes
500
The third grade teachers need 120 cups for the party. There are 20 cups in each pack. How many packs do they need? WRITE the multiplication problem with the unknown, and solve. THINK: Simplify the problem into basic facts (remove the 0's).
r x 20 = 120 r x 2= 12 r=6
500
Devan, Angel, Irving and Joseph share three candy bars equally. How much do they each get? DRAW A PICTURE!!
3/4 of a candy bar
500
Kaylee has 4 shelves of shoes. Each shelf has 11 pairs of shoes. Draw an array to show how many shoes Kaylee has. Find the product.
4 x 11= 44 pairs
500
b x 90 = 360 Solve the problem to find the unknown. THINK: use place value to solve a simpler problem!
b x 90= 360 b x 9= 36 b= 4
500
Dylin wants to check his division fact. 24 (divided by) 6= 4 What multiplication problem could he use to check his answer?
6x4=24
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