How can you represent -5 *-4 with a model?
-5 + -5 + -5 + -5
5*4
4+4+4+4+4
- (-4 + -4 +-4 +- 4 -4)
which of these equations are right
The equation "-5 + -5 + -5 + -5" is the correct representation of -5 * -4 using a model.
The correct representation for -5 * -4 with a model is:
- (-4 + -4 + -4 + -4 + -4)
This equation matches the concept of negative multiplication. When you multiply a negative number by another negative number, it results in a positive value.
To represent the expression -5 * -4 with a model, you can use the following method:
Step 1: Draw a row of 5 units to represent -5.
Step 2: Draw another row of 5 units, parallel to the first row, to represent the second factor, -4.
Step 3: Count the total number of units. In this case, it will be 20 units, which represents -5 * -4.
Therefore, the correct representation of -5 * -4 with a model is a rectangle with 20 units.
Out of the equations you provided, the correct one is "5*4", which represents multiplying 5 by 4.