One way to represent -5 * -4 with a model is by using a number line. Start at 0 and move 5 units to the left to represent -5. Then, move 4 units to the left four times to represent -4. The total distance moved would be 20 units. Therefore, -5 * -4 equals 20.
Another way to represent -5 * -4 with a model is by using counters or objects. Take 5 red counters to represent -5 and 4 black counters to represent -4. Arrange them in a grid with 5 rows and 4 columns. Count the total number of counters, which would be 20. Therefore, -5 * -4 equals 20.
Additionally, you can represent -5 * -4 using the concept of repeated addition. Take -5 and add it to itself 4 times: -5 + -5 + -5 + -5. The sum of these additions would be -20. Therefore, -5 * -4 equals -20.
You can also represent -5 * -4 using the concept of additive inverse. This can be done by taking -4 and adding its additive inverse -4, four times: -4 + -4 + -4 + -4 + -4. The sum of these additions would be -20. Therefore, -5 * -4 equals -20.
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)
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