Two- Digit Addition
Add 52+38
90
How many circles are there? Is the number even or odd? Prove that it is even or odd.
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There are 7 circles. They are odd.
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There are 16 dogs at the park. 29 more dogs run into the park. How many dogs are in the park now?
16+29= 45 dogs
Draw a number line for 26+ 32.
Have teacher check answers
26+ 10+10+10+2
26 36 46 56 58
58 is the answer.
8+13+26+20
67
Which equation has an even sum greater than 12?
a. 2+3=
b. 6+6=
c. 8+7=
d. 8+8=
There are 35 star ornaments on the tree. There are 16 ball ornaments on the tree and 24 snowflakes. How many ornaments are on the tree?
35+16+24= 75 ornaments
Break apart both numbers to add.
63+35=
63 make 60 and 3
35 make 30 and 5
60+30=90
3+5= 8
90+8= 98
Double Jeopardy!
Solve: 25+48
Do you need to regroup?
73
Yes
Draw an array showing 3 rows of 4. Write the equation to go with it.
4+4+4=12
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There are 9 red apples and 7 green apples on the tree. Bob picked 4 apples. How many are left on the tree?
9+7= 16
16-4= 12
12 apples
Break apart one number and solve.
72+ 27=
make 27 a 20 and a 7
72+20= 92
92+7= 99
Choose all the answers that are the same as 32+27.
a. 50+9
b. 40+10+5+4
c. 40+19
d. 95
32+27=59
a and b
Draw an array showing 5 columns of 2. Write the equation to go with it.
2+2+2+2+2=10
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Jeff has 29 marbles. He finds 16 more marbles. He gave 10 to his brother. How many marbles does Jeff have now?
29+16= 45
45-10= 35
35 marbles
Solve with compensation.
62+25=
62 + 25
-2 +2
60+ 27= 87
Choose all the answers that are the same as 59 +29
a. 99
b. 50 +20 +18
c. 80+8
d. 50+20+9
59+29= 88
b and c
Bill has 4 rows of books. There are 3 books in each row. Which equation matches?
a. 4+4= 8
b. 4+3=7
c. 4+4+4=16
d. 3+3+3+3= 12
d
Double Jeopardy
Jim had 36 M&M's. He bought another bag with 62 M&M's. He ate 20 M&M's. How many M&M's did he have left?
36+62= 98
98-20= 78
78 M&M's
Which shows how to count on to find 6+7?
a. 6+7
b. 7+6
c. 7, 8,9,10,11,12,13
d. 7,8,9,10,11,12,13,14
c