Explain that each cube always contains 1,000 blocks, every sheet 100 blocks and every row 10 blocks. This is how you can quickly count how many blocks you see in the image. Then show the problem 1,130 - 500. Count the blocks on the page together. Count how many you have in total, and then how many are taken away and how many blocks you have left over. Discuss the problem 1,230 - 350 = in the same way and have the students solve the following problem on their own. Next show the number line and explain that to solve the problem 1,133 - 571 = you must first take away the hundreds numbers, then the tens values and finally the ones values. After that, discuss the different ways to solve 1,356 - 841 = together and have the students solve the next few problems on their own. Then fill in the table together and have the students fill in the next table on their own. Finally, discuss the steps to solve a story problem. First determine what kind of problem it is and what numbers you need, then make the problem and solve it. Have the students solve the next problem on their own.
Check whether the students can subtract through 1,000 by asking the following question:
- Which method do you use to solve this problem in steps? (1,100 - 137 = ...)