Question

Jan buys 3 bags of beads. Each bag contains 7 beads. Draw a bar diagram and write an addition equation and a multiplication equation to show how many beads Jan buys. How are the equation related?

Answer 1

- The diagram bar is attached.

- Addition equation:
`7+7+7=21`

- Multiplication equation:
`(3)(7)=21`

- How are the equation related? Each equation shows 3 groups of 7.

Step-by-step explanation:

We know that Jan buys 3 bags of beads and each bag contains 7 beads, then, you can draw the bar diagram shown attached.

Observe that the diagram has 3 blocks (each block represents a bag of bead) and there is a number 7 inside of each block (which is the number of beads contained in a bag).

Therefore:

- Add the numbers inside the blocks in order to get the addition equation that shows the number of beads Jan buys. This is:

`7+7+7=21`

- Multiply 3 blocks by 7 in order to get multiplication equation that show the number of beads Jan buys:

`(3)(7)=21`

The equations are related. Each one shows 3 groups of 7.