Number Detective
What number is represented by 6 thousands, 14 hundreds, 3 tens, and 8 ones?
7,438 (6,000+1,400+30+8)
Which unit is most appropriate for measuring the length of a football field: inches, feet, or miles?
Feet
There are 8 boxes of crayons. Each box contains 24 crayons. How many crayons are there altogether?
8x24=192 crayons
Complete the equation: 8 × ___ = 72.
9
Complete the table using the rule “multiply by 6.” If the input is 7, what is the output?
42
Write 8,406 in expanded notation.
(8x1,000)+(4x100)+(6x1)
A ribbon is 5 feet long. Which unit would you use to measure its length most precisely: yards, feet, or inches?
Inches
A teacher has 625 stickers. She gives 238 stickers to her students. Estimate how many stickers she has left by rounding both numbers to the nearest hundred.
600-200=400 stickers
Write an equation to represent this problem: A teacher has 56 pencils and divides them equally among 7 tables. How many pencils does each table receive?
56 ÷ 7 = 8 pencils per table
A table shows these pairs:
2 → 10
4 → 20
6 → 30
8 → 40.
What is the relationship between the input and output?
Multiple by 5
Write this number in standard form: 7,000 + 500 + 20 + 9.
7,529
A student wants to measure the amount of water in a swimming pool. Would liters, gallons, or inches be the most appropriate unit?
Gallons
The school library has 368 books. It receives 147 new books. Ms.Oviedo's classes goes to check out 38 books. How many books does the library have now?
368+147=515
515-38=477
There are 6 bags with the same number of marbles in each bag. Altogether, there are 54 marbles. Write an equation using a letter for the unknown number of marbles in each bag.
6 x 9 = 54
9 marbles per bag
A teacher arranges 48 students into 6 equal groups. Describe a strip diagram that represents the situation and find the number of students in each group.
How many students are there per group?
48 ÷ 6 = 8 students per group.
Put these numbers in order from greatest to least: 6,709; 6,790; 6,079; 6,970.
6,970; 6,790; 6,709; 6,079
What unit of measurement would we use to measure a skyscraper? Inches, feet, or yards or miles. Explain why.
Feet
A school collected 347 cans on Monday and 286 cans on Tuesday. The goal is to collect 800 cans. How many more cans does the school need to reach its goal?
347+286=633
800-633=167 cans needed
Mateo has 4 times as many baseball cards as Luis. Luis has 18 cards. Write an equation and find how many cards Mateo has.
4x18=72 cards
Which table follows the rule “multiply the input by 7”? A: 2 → 14, 3 → 21, 5 → 35.
B: 2 → 9, 3 → 10, 5 → 12.
C: 2 → 7, 3 → 14, 5 → 28.
Table A
I am a four-digit number. My thousands digit is 4. My hundreds digit is twice my thousands digit. My tens digit is 3 less than my hundreds digit. My ones digit is 1 more than my tens digit. What number am I?
4,856
You need to measure three things: the length of a paper clip, the distance between two cities, and the amount of water in a bathtub. Choose the most appropriate unit for each and explain your choices.
Paperclip: Inches
Two cities: Miles
Bathtub: Gallons
A bakery makes 9 trays of cookies with 24 cookies on each tray. The bakery sells 137 cookies. How many cookies are left?
9x24=216
216-137=79 cookies left
A school orders 8 boxes of notebooks with 25 notebooks in each box. The school gives 67 notebooks to third graders. Write an equation that shows how many notebooks remain, and solve it.
8x25=200
200-67=133 notebooks remaining
A pet store has 4 times as many fish as turtles. Complete the table and explain the relationship:
3 turtles → ___ fish;
5 turtles → ___ fish;
8 turtles → ___ fish.
12 fish
20 fish
32 fish
Multiply by 4!