Double digit add/subtract
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Items in this lesson
Slide 1 - Slide
When adding double numbers, first place the numbers above each other, lined up nicely. Let's practice putting the numbers in place.
+ _________
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17 plus 21
30 plus 29
12 plus 54
+ _________
+ _________
1
7
2
1
3
0
2
9
1
2
5
4
Slide 2 - Drag question
Now we add the numbers together, starting from the top, and moving from right to left. Practice 17 plus 21.
+_____
--->
+_____
17
21
--->
+_____
17
21
First, write
the numbers.
Now, add 7
plus 1.
Then, add 1
plus 2.
--->
+_____
17
21
Last, what is
the answer?
1
7
2
1
1
2
3
4
5
6
7
8
9
0
27
18
38
Slide 3 - Drag question
To subtract double numbers, we write our numbers almost the same way but we put the bigger number on top, let's practice!
- _________
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47 minus 21
35 minus 12
68 minus 33
- _________
- _________
4
7
2
1
3
5
1
2
6
8
3
3
Slide 4 - Drag question
Now we subtract the bottom number from the top number, moving from right to left. Practice 57 minus 32.
-_____
--->
-_____
57
32
--->
-_____
57
32
First, write
the numbers.
Now, what is 7 - 2?
Next, what is 5 - 3?
--->
-_____
57
32
Last, what is
the answer?
5
7
3
2
1
2
3
4
5
6
7
8
9
0
55
25
39
Slide 5 - Drag question
Slide 6 - Slide
Mary has 24 apples in her cart, and she sells 16 of them.
How many apples did Mary start with?
How many apples does Mary have left?
24
8
16
6
Slide 7 - Drag question
Jamal's soccer team has 12 players, and the other team has 14 players. How many total players are there?
28
16
32
26
22
Slide 8 - Poll
Jamal has 13 soccer uniforms, and he buys 43 more.
How many uniforms did Jamal start with?
How many uniforms does Jamal have now?
56
13
16
45
Slide 9 - Drag question
The hot air balloon festival starts with 79 big balloons, and 21 of them are red. Later 34 balloons fly away!
How many balloons are left?
How many balloons started the festival?
38
21
45
79
58
