These eight self-checking riddles focusing on representing and multiplying with powers of ten in exponent form are a great resource for classwork, centers, or homework. My kids love doing riddles like these (though I think what they love even more is telling me how corny the jokes are). I, of course, love being able to quickly grade an entire stack of papers!
Common Core State Standards for Mathematics addressed:
Numbers and Operations in Base Ten (NBT)
Understand the place value system.
• Explain patterns in the number of zeros of the product when multiplying a number by powers of 10. Use whole-number exponents to denote powers of 10. (5.NBT.2)
• 8 self-checking puzzles
• answer key for each puzzle
The first three puzzles require students to identify equivalent forms of powers of ten, matching word form, standard form, and multiplication expressions to exponent form. For the first two puzzles, students simply have to match equivalent forms of powers of ten; for the third puzzle, students compare powers of ten – one in exponent form and the other in standard form. The other five puzzles involve multiplying numbers by powers of ten, represented in exponent form. Puzzles four through seven use single digit factors (e.g., 4 x 10^3), while the eighth puzzle uses two-digit factors, as in 38 x 10^5.
The included Table of Contents
lists the puzzles, as well as the skills on which the puzzles focus, and the pages on which each puzzle/answer key are found so you can more easily print out the exact puzzle you need.
There are many ways in which you can use these puzzles pages. Your students can complete them on their own, in pairs, or in small groups. The riddles can be used as center work, drill, classwork, assessment, or homework. The riddle pages have a range of 9 to 15 problems, so none of them should take very long to complete, and keys are included for all six, so scoring should not take too long either! [Though since these are self-checking, your grading workload should be light ☺]
Looking for more practice with powers of ten? Check out:
Super Powers of Ten - task cards + printables (set a)
Super Powers of Ten - task cards + printables (set b)
Super Powers of Ten board game & card game set
I hope your students enjoy these resources and are able to build their proficiency with adding and subtracting with unlike denominators. – Dennis McDonald