Final answer:
To calculate 10% of 70 using a bar model, divide a bar representing 70 into 10 equal parts. Each part is 7, so 10% of 70 is 7.
Step-by-step explanation:
To find 10% of 70 using a bar model, imagine a bar that represents 100% of the quantity, in this case, 70. Divide this bar into 10 equal sections, each representing 10% of the total. Since each section is 10% of 70, finding one section will give you the answer. One section is 10% of 70, which can be calculated as (10/100) * 70 = 7. So, 10% of 70 is 7.