Cosmic Sums Worksheet
Cosmic Sums Practice
Mission 01: Single-Digit Addition Mastery
Page 1 of 2
Name:
Date:
Score: / 20
Part 1: Visual Launchpad • Model & Solve
1 Draw 3 more stars to solve:
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4 + 3 =
2 Draw 4 more stars to solve:
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6 + 4 =
3 Start at 5, hop forward 3:
0 1 2 3 4 5 6 7 8 9 10
5 + 3 =
4 Start at 2, hop forward 7:
0 1 2 3 4 5 6 7 8 9 10
2 + 7 =
Part 2: Star Speed Fact Fluency • Horizontal
Solve quickly
#5
3 + 2 =
#6
4 + 5 =
#7
1 + 8 =
#8
7 + 2 =
#9
6 + 3 =
#10
2 + 6 =
#11
5 + 5 =
#12
8 + 0 =
Turn to Page 2 for vertical addition equations and cosmic word problem challenges! →
Cosmic Sums Practice
Mission 02: Vertical Equations & Story Problems
Page 2 of 2
Name: Section B • Continued
Part 3: Rocket Stack • Vertical Addition
#13
4
+ 4
#14
3
+ 6
#15
5
+ 2
#16
2
+ 7
#17
7
+ 1
#18
1
+ 8
#19
6
+ 2
#20
8
+ 1
Part 4: Cosmic Story Problems • Read, Draw & Solve
21
Astronaut Leo spotted 4 blue stars through his telescope. Later, he spotted 5 gold stars. How many stars did Leo see in all?
Draw a picture or dots:
Equation:
Answer: stars
22
Maya built 3 space rovers on Monday and 6 space rovers on Tuesday. How many rovers did she build altogether?
Draw a picture or dots:
Equation:
Answer: rovers
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Bonus Supernova Challenge:
Find the missing number: 3 + = 9
Mission Accomplished!
Cosmic Sums Answer Key
Cosmic Sums
Answer Key
Mission 01: Visual Models & Horizontal Fluency
Key • Page 1 of 2
Grading Guide: 1 point per problem • Total Page 1 = 12 Points
TARGET: Grade K-2 Addition Facts
Part 1: Visual Launchpad • Solutions
1 3 red stars drawn:
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4 + 3 =
7
2 4 red stars drawn:
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6 + 4 =
10
3 Jump 3 units → lands on 8
0 1 2 3 4 5 6 7 8 9 10
5 + 3 =
8
4 Jump 7 units → lands on 9
0 1 2 3 4 5 6 7 8 9 10
2 + 7 =
9
Part 2: Star Speed Fact Fluency • Solutions
1 pt each
#5
3 + 2 =
5
#6
4 + 5 =
9
#7
1 + 8 =
9
#8
7 + 2 =
9
#9
6 + 3 =
9
#10
2 + 6 =
8
#11
5 + 5 =
10
#12
8 + 0 =
8
Page 1 Key Complete • See Page 2 for Vertical Equations, Word Problems & Bonus Solution →
Cosmic Sums
Answer Key
Mission 02: Vertical Equations & Story Problems
Key • Page 2 of 2
Part 3 = 8 Points • Part 4 = 4 Points (2 pts/problem) Section B • Continued
Part 3: Rocket Stack • Vertical Solutions
#13
4
+ 4
8
#14
3
+ 6
9
#15
5
+ 2
7
#16
2
+ 7
9
#17
7
+ 1
8
#18
1
+ 8
9
#19
6