4th Grade Multiplication
Even More Multiplication!
Vocabulary
Estimating & Rounding
Mystery Math
100
57 x 3
171
100
564 x 2
1,128
100
What is an arrangement of equal sized rows and columns used to show multiplication called?
An Array
100
What is 8,412 rounded to the nearest hundred?
8,400
100
What's the answer to a multiplication problem called?
Product
200
38 x 5
190
200
78 x 9
702
200
What property of multiplication is this an example of?
The Associative Property of Multiplication
200
What is 36,765 rounded to the nearest ten thousand?
40,000
200
Multiply 288 x 6 using Partial Products.
6 x 200 = 1,200
6 x 80 = 480
6 x 8 = 48
1,200 + 480 + 48 = 1,728
300
234 x 4
936
300
2,012 x 3
6,036
300
The ________ Property of Multiplication means you can multiply factors in any order and still get the same answer.
Ex. 3 x 5 = 15 OR 5 x 3 = 15
The Commutative Property of Multiplication
300
Sally estimated that 352 x 4 is about 1500. Is Sally's estimate reasonable? Why or why not?
Sally's estimate is reasonable. 352 x 4 is 1408, which is close to 1500.
300
How many times bigger is 40,000 compared to 400?
100 times bigger
400
524 x 6
3,144
400
500 x 9
4,500
400
In this multiplication strategy, you can break up a larger multiplication problem into smaller parts that are easier to multiply.
Partial Products
400
Danny estimated that 4251 x 8 is about 20,000. Is Danny's estimate reasonable? Why or why not?
Danny's estimate is not reasonable. 4251 x 8 is 34,008, which is not close to 20,000.
400
4,671 + 56,329
61,000
500
Mr. Franklin is is buying boxes of donuts for students. There are 14 donuts in each box and he needs to buy boxes for 51 students. How many donuts will he buy in all?
714
500
1,892 x 6
11,352
500
What multiplication strategy is this an example of?
3998 x 3
= (4000 - 2) x 3
= (4000 x 3) - (2 x 3)
= 12000 - 6
= 31,994
Compensation
500
Estimate the product of 5,339 x 5
Your estimate should be close to 26,695
500
Use an Array Model or Area Model to find the product of 7,363 x 4
29,452