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Arizona Math Standard: 2.NBT.B.7

Demonstrate understanding of addition and subtraction within 1000, connecting objects or drawings to strategies based on place value (including multiples of 10), properties of operations, and/or the relationship between addition and subtraction. Relate the strategy to a written form.

Broken Calculator: 2-Digit Addition Gr 1-4
Broken Calculator: 2-Digit Subtraction Gr 1-4
Adding and Subtracting Fruit
Adding and Subtracting Fruit
Use super cute fruit to introduce algebraic thinking to your young math students.
Gr 1, 2, 6
Contig
Contig
Roll three dice and combine them using any mathematical operation. But be strategic to maximize your points!
Gr 1-4
Spring Math Worksheets: Addition and Subtraction
Spring Math Worksheets: Addition and Subtraction
Four sets of 2-digit and 3-digit addition and subtraction practice. But the unknown isn’t where you expect it to be!
Gr 1-4
How Many Will There Be? Chip Off The Block
How Many Will There Be? Chip Off The Block
Give kids a taste of a sequence, let them build an understanding, and then see how far their predictions can take them.
Gr 1-5
How Many Ways: Fraction Subtraction 234
How Many Ways: Fraction Subtraction 234
How many different ways can you make this fraction subtraction statement true using only the digits one through nine?
Gr 1, 3, 4, 5, 7
How Many Will There Be? Xs and Os
How Many Will There Be? Xs and Os
Give kids a taste of a sequence, let them build an understanding, and then see how far their predictions can take them.
Gr 1-7
How Many Will There Be? Desks
How Many Will There Be? Desks
Give kids a taste of a sequence, let them build an understanding, and then see how far their predictions can take them.
Gr 2-5
How Many Will There Be? Stairs
How Many Will There Be? Stairs
Give kids a taste of a sequence, let them build an understanding, and then see how far their predictions can take them.
Gr 1-5
Game: Number Scrabble
Game: Number Scrabble
What if we played Tic-Tac-Toe with numbers and instead of three-in-a-row, we add up to 15? Well… then we’d have Number Scrabble!
Gr 1-5
Addition: 3 Digits Plus 2 Digits (Multiple Solutions)
Addition: 3 Digits Plus 2 Digits (Multiple Solutions)
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 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
Subtraction: 3 Digits Minus 2 Digits (Multiple Solutions)
Subtraction: 3 Digits Minus 2 Digits (Multiple Solutions)
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 1-4
Evens and Odds – Addition and Subtraction
Evens and Odds – Addition and Subtraction
When we’re adding and subtracting, do evens make odds into evens? Do odds make evens odd? Which one has… more power!?
Gr 1, 2, 3, 4, 7
How Many Ways: Times Equals Minus
How Many Ways: Times Equals Minus
How many different ways can you make this math statement true using only the digits one through nine?
Gr 1, 2, 3, 4, 6, 7
Math Curiosity: Magic Squares
Math Curiosity: Magic Squares
Imagine a 3×3 square in which every row, column, and diagonal have the same sum. That’s a magic square!
Gr 1, 2, 3, 4, 7
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: Primes and Squares
Math Curiosity: Primes and Squares
Can any perfect square be written as the sum of two primes?
Gr 1, 2, 3, 4, 5, 6, 8
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