Transcript 2-8 Multiply Three Digits

Multiply Three Digits
Honors Math – Grade 5
Problem of the Day
Norma’s father has a vegetable farm of 126 rows of
tomato plants. Each row has 178 plants. How
many tomato plants are on the farm?
Before we solve this problem, let’s
review our basic multiplication facts!
Math Minutes – Multiplication Facts Review
Problem of the Day
Norma’s father has a vegetable farm of 126 rows of
tomato plants. Each row has 178 plants. How
many tomato plants are on the farm?
What are the important facts?
What operation does this
word problem suggest?
Multiplication! Let’s take a closer look…
Setup the problem.
Aligning the factors is
key!
Remember to align each
place value column.
Always start in the 1’s
column.
Now, we are done with
the 1’s column. Before
we multiply by 10’s.
What must happen?
Now, we are done with
the 1’s AND the 10’s
column. What do you
think must happen?
126
 178
When multiplying by
100’s, you must add 2
zeros before you begin!
TAG the answer.
There are 22,428 tomato plants on the farm.
427 324
607 214
5192 274
Find the product of n x 6350 when n = 528.
When a mathematical sentence
has a variable, replace the
variable with its given value.
VOCAB ALERT
Variable – A letter, such as n, that
is used to represent a number.
For example, n = 528. So, we
replace n with 528 and multiply.
n  6350
528 6350