Break Apart Method
When using the break apart method, how would you break apart 612 in the equation 5 X 612
600 10 2
Fill in the blanks and solve
18
X 3
_________
__ __
+ __ __
________
___ ____
24
30
54
When using standard algorthm you will probably have to do a lot of r _ _ _ _ _ _ _ _ _
regrouping
Please list all digits
0,1,2,3,4,5,6,7,8,9
Please round 14
10
Solve using the break apart method:
7 X 372
7 X 300 = 2,100
7 X 70 = 490
7 X 2= 14
Answer: 2,604
The expanded algorithm is very similar to what additon strategy?
Expanded form
Use standard algorithm to solve
56 X 3
168
When estimating, you always round to ____
THE HIGHEST PLACE VALUE
Please round 578
600
Solve using the break apart method:
8 X 591
8 X 500 = 4,000
8 X 90 = 720
8 X 1 = 8
Answer: 4,728
Solve using expanded algorithm
79 X 7 =
553
Use standard algorithm to solve
1,345 X 4
5,380
What does partial product mean?
Parts of a product
Ex: 5 X 12
5 X 10= 50
5 X 2 = 10 50 and 10 are partial products
Use estimation to solve
6 X 352=
6 X 400 = 2,400
7 X 4__2=?
7 X 400 =
7X 30 =
7 X 2 =
7 X 432=3,024
Solve using expanded algorithm
1,234 X 9 =
11,106
Solve using standard form
6 X 2,716 =
16,296
Write a number with a 7 in the hundreds place
7_ _
Use estimation to solve and determine if your estimate is reasonable
3 X 2,498=
3 X 2,000 = 6,000
3 X 2,498= 7,494
Not reasonable
Fill in the blank and solve
3 X 2, _41
3X 2,000=
3X 700=
3X 40 =
3X 1=
8,223
Solve using expanded algorithm
A road repair crew can usually fix 825 potholes each week. How many potholes can they fix in 6 weeks?
4,950 potholes
Solve using expanded algorithm
Which tire shop would be the cheapest if I need to buy 4 tires:
Option A: Buy 3 tires for $175 each and get the 4th tire free
Option B: Buy 4 tires at $135 each
Option A
Draw an array with 6 rows and 4 columns
* * * *
* * * *
* * * *
* * * *
* * * *
* * * *
Estimate and find the actual answer
1,589 X 5 =
2,000 X 5 = 10,000
1,589 X 5 = 7,945