Step I used place value blocks and made a group of 1 25 and a group of 18. When I counted them I had 3 tens and 13 ones which is 43. Step I then wanted to remove blocks until there were 2 only 14 left. I removed blocks until there were 20 left. Step Since I have two tens I need to trade a ten for 3 10 ones. Step After I traded it, I removed blocks until there 4 were only 14 remaining. Step My answer was the number of blocks that I removed. I removed 2 tens and 9 ones. 5 That’s 29. My equation is 25 + 18 ___ = 14. – Student 2 I used a number line. I started at 25 and needed to move up 18 spots so I started by moving up 5 spots to 30, and then 10 spots to 40, and then 3 more spots to 43. Then I had to move backwards until I got to 14 so I started by first moving back 20 spots until I got to 23. Then I moved to 14 which were an additional 9 places. I moved back a total of 29 spots. Therefore there were a total of 29 students left in the cafeteria. My equation is: 25 + 18 ___ = 14. – Student 3 Step I used a hundreds board. I started at 25. 1 I moved down one row which is 10 more, then moved to the right 8 spots and landed on 43. This represented the 18 more students coming into the cafeteria. Step Now starting at 43, I know I have to get 2 to the number 14 which represents the number of students left in the cafeteria so I moved up 2 rows to 23 which is 20 less. Then I moved to the left until I land on 14, which is 9 spaces. I moved back a total of 29 spots. That means 29 students left the cafeteria.
Step 1 I used place value blocks and made a group of 25 and a group of 18. When I counted them I had 3 tens and 13 ones which is 43. Step 2 I then wanted to remove blocks until there were only 14 left. I removed blocks until there were 20 left. Step 3 Since I have two tens I need to trade a ten for 10 ones. Step 4 After I traded it, I removed blocks until there were only 14 remaining. Step 5 My answer was the number of blocks that I removed. I removed 2 tens and 9 ones. That’s 29. My equation is 25 + 18 – ___ = 14. Student 2 I used a number line. I started at 25 and needed to move up 18 spots so I started by moving up 5 spots to 30, and then 10 spots to 40, and then 3 more spots to 43. Then I had to move backwards until I got to 14 so I started by first moving back 20 spots until I got to 23. Then I moved to 14 which were an additional 9 places. I moved back a total of 29 spots. Therefore there were a total of 29 students left in the cafeteria. My equation is: 25 + 18 – ___ = 14. Student 3 Step 1 I used a hundreds board. I started at 25. I moved down one row which is 10 more, then moved to the right 8 spots and landed on 43. This represented the 18 more students coming into the cafeteria. Step 2 Now starting at 43, I know I have to get to the number 14 which represents the number of students left in the cafeteria so I moved up 2 rows to 23 which is 20 less. Then I moved to the left until I land on 14, which is 9 spaces. I moved back a total of 29 spots. That means 29 students left the cafeteria.
2nd-Math-Unit-2.docx