Adding Two-Digit Numbers
Mental Math
Adding 3 One-Digit Numbers
Adding 3 Two-Digit Numbers
Problem Solving
100
17+32=
49
100
Use mental math to solve the problem below: 36 + 23 =
59
100
1+2+3=
6
100
10+20+40=
70
100
A fish tank holds 25 guppies and 18 goldfish. How many fish fit in the tank?
25+18=43 fish
200
51+ 29
80
200
Use mental math to solve this problem: 25 + 14 =
39
200
3+4+2=
9
200
22+33+44=
99
200
A classroom has 18 desks and 24 chairs. How many desks and chairs does the classroom have all together?
18+24= 42
300
35+57=
92
300
Explain how you can use mental math to add these numbers. 25 + 12 =
First add 20 + 10 = 30 Then add 5 + 2 =7 Finally add 30 + 7 =37
300
6+5+7=
18
300
25+12+23=
60
300
Michael spends $ 27 for tickets to a baseball game and $ 24 on food. How much money did he spend all together?
$27 + $ 24 = $51
400
65+29=
94
400
Use mental math to solve this problem: 72 + 18 =
90
400
8+8+8=
24
400
45+14+23=
82
400
Ashley has 30 crayons, Alex has 20 crayons, and Katie has 40 crayons. How many crayons do they have all together?
30+20+40=90 crayons
500
76+88=
164
500
Use mental math to find the sum: 34 + 25 = Explain how use found the sum.
59 Answers can vary
500
9+7+6=
22
500
45+56+37=
138
500
Class 1- has 24 students. Class 2- has 22 students and Class 3- has 26 students. How many students do the three classes have altogether?
24+22+26= 72 students
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