Problem: My college students have such a tough time with unknowns in all positions of math issues. (Common Core requirements 1.OA.A.1, 2.OA.A.1)
Solution: Give them loads of publicity to part-part-whole! It appears so fundamental, only a manner of exhibiting the 2 smaller numbers that mix to make an even bigger quantity. As proven on the image, three and 6 are the components, put them collectively and 9 is the entire. It could be proven with circles (referred to as quantity bonds or math mountains when turned to level upward), made with cubes, and represented with equations. Look at how part-part-whole helps with an unknown firstly of an equation:
Rachel had some pencils. Her instructor gave her 6 extra pencils. Then she had 9 pencils. How many pencils did Rachel have to begin?
We know the entire is 9 and one of many components is 6. Using a part-part-whole illustration kids can discover the lacking half both by relying on or by subtracting.