Lesson: Adding Whole Numbers
Do Now (5 min):
Write the meaning of the words addend, sum, and multi-digit.
Opening (5 min):
Review basic facts using for "snap math". Ask 1+1 = (snap for student's to give the sum); repeat 20 times using various addend.
Direct Instruction (15 min):
- State today's objective. Review the meaning of the words addend and sum, and multi-digit. Model how to add 58 to 46.
- Think aloud while solving the problem by saying: First, add the ones column first. Then, we take the 1 over to the tens column. The 1 that we carry over has a place value of 10. We'll put a 1 here in the tens place since that means that there is 1 ten.
- Write the number 6,425 on the number on the whiteboard. Say the number. Write 1,724 whiteboard. Write a plus sign between each number.
- Restate the objective.
- Explicitly tell students that "the best way to solve this problem is to stack digits on top of each other. I will show you how to do this by using a grid. Remind students that every digit has a place and every place has a value. Point to the "O" on the grid, tell students that the O is the ones place. Say " In the number 6,425, 5 is in the ones place so I will write that under "O". In the number 1,724, "4" is in the ones place so I will write "4" under 5 in the ones place. Point to the T on the grid. Repeat the same process for the hundreds and thousands place. Afterwards, go back to the ones place and add 5 + 4, repeat until sum of 8,149 is written on the grid.
- Use grid paper to model how to solve. Stack each digit in its appropriate place. Solve.
Guided Practice (10 min):
Distribute Guided Practice for Adding Whole Numbers worksheet.
Solicit student's help in solving 2,397+1,205.
Ask for student's help in solving 15,490+1,349.
Ask students why it is important to put numbers in their correct column or places. Discuss.
Independent Practice (10 min):
Solve six similar multi-digit addition problems.
Closing (5 min):
Write the following multi-digit problem on the board that is incorrectly solved (i.e. 4,507 + 3,006 = 6,512). Ask students to 1. Solve the problem correctly; 2. Explain in which place(s) the mistake was made.
|Adding Whole Numbers IP Activity||
|Adding Whole Numbers GP Activity||