Jones uses the subtraction algorithm to subtract 8−15 and gets the answer −7. They want to connect this expression and answer to a number line model. How should they complete their number line model to show why the answer is −7?
(2 points)
Jones should draw an arrow starting at
that connects to
. The arrow will show that they need to move
in the negative direction to connect the two numbers. Therefore, the answer is −7
Jones should draw an arrow starting at -8 that connects to -15. The arrow will show that they need to move 7 units in the negative direction to connect the two numbers. Therefore, the answer is -7.
To show why the answer is -7 on a number line model, Jones should follow these steps:
1. Draw a number line with zero in the middle.
2. Mark the position of 8 on the number line.
3. Move 15 units to the left (in the negative direction) from the position of 8.
4. Mark the new position reached after moving 15 units to the left.
5. Draw an arrow starting from the position of 8, pointing towards the new position reached after moving 15 units to the left.
6. Write -7 next to the new position to indicate that the answer is -7.
By connecting the position of 8 to the new position reached after moving 15 units to the left, showing the arrow moving in the negative direction, and indicating -7 as the answer, Jones can complete their number line model to demonstrate why the answer is -7.