What is the difference of 30 minus 10? 40 20 2 20 What is the difference of 60 minus 30? 30 3 57 30 What is the difference of 84 minus 30? 54 attention 22 22 0 Do you see the pattern? What is the difference of 65 minus 36? 31 62 29 29 How much is 15 minus 12? 3 13 27 3 How much is 42 minus 24? 18 attention rectangle Did you catch that? Will you have to trade to find the difference? yes no yes no What is the difference of 550 minus 225? 225 250 325 325 What is the difference of 543 minus 154? 389 411 697 389 What will we subtract when we trade? 3 - 5 13 - 5 10 - 5 13-5