Cosmic Countdown WorksheetLevel: Cadet COSMIC COUNTDOWN Cadet Training: Tens & Ones Drawing Log Name: Date: Welcome, Space Cadet! Your spaceship needs coordinates! Help launch the rocket by drawing the tens and ones for each cosmic number below. 1 Star Rods (Base-10) Draw a tall rod for each Ten. Draw a small star for each One. Key: = 1 Ten (10) = 1 One (1) Example: 12 = 15 Draw Area ___ Ten ___ Ones 24 Draw Area ___ Tens ___ Ones 31 Draw Area ___ Tens ___ One 2 Alien Ten-Frames Each ten-frame holds up to 10 dots. Draw dots to show each cosmic coordinate! 18 ___ Ten ___ Ones 25 ___ Tens ___ Ones Cosmic Math Academy • Place Value Page 1 of 2 Level: Cadet COSMIC COUNTDOWN Cadet Training: Tens & Ones Drawing Log Log Page: 2 3 Comet Tally Marks Each bundle of 10 tally marks counts as a Ten. Single tally marks count as Ones! Key: I \= 1 One Example: 11 = ~~~IIII~~~ ~~~IIII~~~ I 13 Draw Tallies Here \_\_\_ Ten \_\_\_ Ones 22 Draw Tallies Here \_\_\_ Tens \_\_\_ Ones 4 ### Cosmic Code Breaker Create your own coordinates! Choose any number between **11 and 39**. Draw it using star rods and write the values. My Cosmic Number is: Tens Ones Draw Your Cosmic Rods & Stars Here Draw clearly so the spacecraft can decode your message! Mission Authorized Cosmic Math Academy • Place Value Page 2 of 2
Cosmic Countdown Answer KeyANSWER KEY Teacher Guide COSMIC COUNTDOWN Answer Key • Grade 1 Place Value Name: CADET NOVA Date: SPACEY DATE Grading & Facilitation Tips Verify that student drawings show correct quantities. Ensure base-ten tens are drawn distinctly longer/taller than the individual units/ones. 1 Star Rods (Base-10) Draw a tall rod for each Ten. Draw a small star for each One. 15 Answer Key 1 Ten 5 Ones 24 Answer Key 2 Tens 4 Ones 31 Answer Key 3 Tens 1 One 2 Alien Ten-Frames Each ten-frame holds up to 10 dots. Draw dots to show each cosmic coordinate! 18 1 Ten 8 Ones 25 2 Tens 5 Ones Cosmic Math Academy • Answer Key Page 1 of 2 ANSWER KEY Teacher Guide COSMIC COUNTDOWN Answer Key • Grade 1 Place Value Log Page: 2 3 Comet Tally Marks Each bundle of 10 tally marks counts as a Ten. Single tally marks count as Ones! 13 Answer Key | III 1 Ten 3 Ones 22 Answer Key ~~~IIII~~~ ~~~IIII~~~ ~~~IIII~~~ ~~~IIII~~~ II 2 Tens 2 Ones 4 ### Cosmic Code Breaker Create your own coordinates! Choose any number between 11 and 39. Draw it using star rods and write the values. Sample Response • Student choices will vary (11-39) My Cosmic Number is: 34 3 Tens 4 Ones Sample Drawing Verify student drawn quantities match their chosen number. Mission Standards Approved Cosmic Math Academy • Answer Key Page 2 of 2
