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Grade 1

Arizona Math Standard: 1.NBT.B.2

Understand that the two digits of a two-digit number represent groups of tens and ones. Understand the following as special cases:

Broken Calculator: 2-Digit Addition Gr 1-4
Subtraction: 3 Digits Minus 2 Digits (Single Solution)
Subtraction: 3 Digits Minus 2 Digits (Single Solution)
Typical practice problems don’t move students up Bloom’s Taxonomy. With this framework, you’ll see kids stop and really think about how to approach multi-digit subtraction.
Gr 1, 2, 3, 4, 6
Math Curiosity: Goldbach’s Conjecture
Math Curiosity: Goldbach’s Conjecture
Can any even number be written as the sum of two primes? Goldbach thought so, but we haven’t proven it… yet!
Gr 1-5
What If There Were No Hundreds Place?
What If There Were No Hundreds Place?
Imagine a world with no hundreds place. We’d have to call it ten tens instead. But then, what would we call the thousands place? How would we read 9999? What if we added one more?
Gr 1, 2, 3, 4, 5, 8
Place Value (Beyond Base 10)
Place Value (Beyond Base 10)
Place value is something we cover in elementary school. It seems simple, but I’d wager that very few adults really understand the topic. I sure didn’t until I worked with non-base-10 number systems in college. Your students can get a taste of this mind-boggling experience by imagining what it would be like if we didn’t have the number 9. What would each digit represent then?
Gr 1-6
Math Curiosity: Palindromic Number Conjecture
Math Curiosity: Palindromic Number Conjecture
Using this one weird trick, it seems that you can turn any number into a palindrome!
Gr 1-5
The Game of 100
The Game of 100
Who can get to 100 first in this simple, but delightful, math game?
Gr 1-4