One way of practicing addition and subtraction together is playing Shake Those Beans!
Yes, it does get a bit loud in the classroom but the math you hear is incredible! They shake the beans and spill them out on the placemat. Sort the red and yellow, then compose an addition sentence using the red number as the 1st addend. I love when they put them in a pattern like my friend Reese who put them in a 4 dot formation like on dice to reveal the number sentence 4+4=8. They are such mathematicians! Check out as Timmy and Logan play a round of Shake Those Beans. I notice at the end they each have something close to what the other has...do you notice too? Make sure to pay attention to the part where the music is in the video.