3 Digit Addition
123
+247
370
6 401
+1 069
7 470
19 543
+51 429
70 972
Explain: When do you need to regroup when you are adding?
When the answer is double digits.
(when the answer is more than 9)
On Halloween, our little buddies came to our classroom to carve pumpkins. There were 20 kindergarten students and 25 grade 4/5 students.
How many students were carving pumpkins in our classroom all together?
45 students were carving pumpkins all together on Halloween.
584
+338
922
2 451
+6 578
9 029
84 395
+13 016
97 411
Why is it important to line up the numbers before you start adding?
Example: 123
+321
So that the digits with the same place value are lined up.
Give an example of how you could use addition when you are shopping.
Answers could be:
- how many items you are buying in total
- adding up prices to make sure you have enough money
785
+ 46
831
51 790
+37 212
89 002
72 486
+24 355
96 841
Which place do you start with when you are adding? Why?
a) tens place
b) thousands place
c)ones place
d) hundreds place
c) ones place
Example: because you carry the larger numbers into the higher place values.
Give an example of a time you used addition this weekend.
Example: Ms. Brickenden was playing Yahtzee and had to add up the numbers on all of the dice.
352
+859
1 211
7 862
+4 259
12 121
13 983
+90 148
104 131
When you are adding, does it matter which number is on top? Why?
Example:
35 OR 20
+20 +35
It does not matter because the answer will still be the same.
Example: Both problems will equal 55.
Ms. Brickenden put her Christmas tree up. She started by putting up ____ ornaments. Her brother came over to help and he put up ____ more ornaments. When they are done, there are 80 ornaments on the tree.
How many ornaments did each of them put on the tree?
______ + _______ = 80
Some answers could be:
40 + 40 = 80
50 + 30= 80
29 + 51= 80