Rounding/Place Value
Round 78 to the nearest 10.
80
Write this number in expanded form.
785
700 + 80 + 5
Subtract 704 - 386.
318
This method requires you to multiply the numbers that are not zero first, then count how many additional zeros are in the equation to get your final answer.
Use any method to solve 235 x 5.
1,175
What is the value of the 3 in 45,368?
300
Write this expanded equation in standard form.
200 + 50 + 9 + 600 + 90 + 2
259 + 692
Add 5,643 + 3,428.
9,071
This is the method that was taught to your great grandparents, grandparents, and possibly parents.
Standard Algorithm
Use any method to solve 3,243 x 7.
22,701
Round 634 to the nearest hundred.
600
Expand this equation. 568 + 234
500 + 60 + 8 + 200 + 30 + 4
What is 600 x 500?
300,000
This method requires you to solve using rounding and multiplying by zeros.
Mental Math
Use any method to solve 35 x 23.
805
What is the value of 7 in 678,435?
70,000
What is this expanded number written in standard form? 500,000 + 70,000 + 8,000 + 60
578,060
What is 3,000 x 200?
600,000
This method requires you to create multiplication equations to solve and place the answers beneath the problem (stacked), then add for final answer.
Partial Products
Use any method to solve 67 x 45.
3,015
Round 4,689 to the nearest thousand.
5,000
Expand 456,357.
400,000 + 50,000 + 6,000 + 300 + 50 + 7
What is 4,000 x 300?
1,200,000
This method requires you to draw boxes based on the number of digits in the equation, expand the numbers in the equation on top and bottom of boxes, then multiply inside the boxes, and finally add outside the boxes for final answer.
Place Value Box Method
Use any method to solve 98 x 87.
8,526