Ten free 8th grade word problems about space, with an answer key. Type your kid's first name and every problem is about them; press "New problems" for a fresh sheet as often as you like.
This sheet mixes two-step equations, proportions, percent increase and decrease, simple interest, adding and subtracting integers, and mean (average) (8th-grade equation solving plus 7th-grade review). Each problem is built from a checked math template, so the numbers change every time but the answers are always right; only the story is about space.
Print it, or let your kid work it on screen and check each answer as they go. No sign-up, and the name you type stays on your device.
✦ Mathbloom · free worksheet
Space Math
8th Grade · Two-step equations · Proportions · Percent increase and decrease · Simple interest · Adding and subtracting integers · Mean (average)
Name Date
Sam has 19 glow-in-the-dark stars in all: 11 loose glow-in-the-dark stars plus 4 bags with the same number of glow-in-the-dark stars in each bag. If x is the number of glow-in-the-dark stars in each bag, solve 4x+11=19.
A.x=7.5
B.x=4.75
C.x=2
D.x=8
Sam uses red LEDs and white LEDs in a ratio of 6:3 on a model space station. How many red LEDs go with 26 white LEDs?
Answer:
Last month, 20 visitors came to the planetarium show. This month, Sam counted 25. What is the percent increase?
A. 20%
B. 25%
C. 5%
D. 12.5%
Sam's astronomy club raised $600 at a bake sale and put it in a savings account that pays 1% simple interest per year. How much interest will it earn in 2 years?
Answer:
Sam keeps track of the height changes of a model rover on a hilly test course: -1 meter on the first drive and -14 meters on the second drive. What is the total change in height?
Answer:
Over five nights, Sam logged this many observations: 7, 1, 6, 9, 12. Find the mean (the average) number of observations per night.
Answer:
Sam has $5 saved toward a bigger telescope. After adding the same amount each week for 6 weeks, Sam has $47. Solve 6x+5=47 to find x, the number of dollars added each week.
A.x=8.67
B.x=7.83
C.x=7
D.x=42
Sam uses star stickers and planet stickers in a ratio of 3:9 on a bedroom ceiling map. How many star stickers go with 9 planet stickers?
Answer:
Last month, 20 visitors came to the planetarium show. This month, Sam counted 24. What is the percent increase?
A. 20%
B. 16.67%
C. 4%
D. 10%
Sam's astronomy club raised $500 at a bake sale and put it in a savings account that pays 2% simple interest per year. How much interest will it earn in 6 years?
Answer:
The key always prints on its own page.
Answer key
Space Math · 8th Grade
C. x=2Undothe+11first(subtractfrombothsides),thenundothe×4(dividebothsides):x=2.
52Cross-multiply:6×26=156,thendivideby3:x=52.
B. 25%Percentchange=(change÷original)×100=(5÷20)×100=25%.
12.00600×0.01×2=$12.00.
-15-1+-14=-15.
77+1+6+9+12=35,and35÷5=7.
C. x=7Undothe+5first(subtractfrombothsides),thenundothe×6(dividebothsides):x=7.
3Cross-multiply:3×9=27,thendivideby9:x=3.
A. 20%Percentchange=(change÷original)×100=(4÷20)×100=20%.
60.00500×0.02×6=$60.00.
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Questions parents ask
Are these worksheets really free?
Yes. Make, print, and play as many sheets as you like, no account and no card.
Is there an answer key?
Yes. It prints on its own page after the problems, and each answer comes with a short explanation.
Can I put my kid's name in the problems?
Yes. Type a first name and every problem uses it. The name is only used on this page in your browser; it is not sent anywhere or saved.
What does the 8th grade sheet cover?
Two-step equations, Proportions, Percent increase and decrease, Simple interest, Adding and subtracting integers, and Mean (average), a mix of 8th-grade equation solving and 7th-grade review. You can also pick a single topic for a focused sheet.
Can my kid do it on screen instead of paper?
Yes. "Play on screen" lets them answer each problem and see right away whether it is right, with a hint when it is not.
Is there more than worksheets?
Mathbloom builds whole interactive courses around what a kid loves. You can try a free space lesson for 8th grade with no sign-up.