In lesson 76 of Level A (problem solving) I have questions regarding problems 5, 8, 10 and 11.
Should problem 5 be solved by using the math balance as my child could not figure it out with the abacus (it was 11 - 5 = 6)
Should problem 8, 10, 11 be solved using fractions?
Thank you for your message. Looking at Lesson 76 in Level A, the directions say to use the clock for all of the problems, but there is a note under the lesson saying have your child solve the problem any way he likes, including using the abacus.
This being said for problem 5, you can use the balance, that would be just fine. As long as he/she is able to solve the problem using different items.
With problems 8, 10, and 11 you can also use whatever your child works best with. Using the fractions works out okay, or you can use the colored tiles and when the process of having to split the item comes up, ask your child how you can share that item. This would work great with problem 11, relating to cookies! Your child will have the concept that since there is only one whole cookie for 2 people, that they have to share. Ask them what is fair for how to divide the cookie. Sometimes when we deal with food, especially cookies, it is easier to figure out the division! :) Don't forget the note also says that you can change the names and objects!
Let me know if you have any further questions, we are here to help! :)