Word Problems with One Addend Unknown - Up to 20
🤝 Addition is all about finding two parts that make a whole. But what happens if one of the parts goes missing?
Do this: Read the concept below, then try the quiz or activity.
Concept
An "addend" is just a fancy math word for a number you add. (In 5 + 3 = 8, the 5 and the 3 are addends).
🎯 The Missing Addend Puzzle: Story: "A toy store has 18 teddy bears in total. 10 of them are brown, and the rest are white. How many are white?" * Whole (Total): 18 bears. * Part 1 (Addend): 10 brown. * Part 2 (Addend): ??? white.
Equation: 10 + ??? = 18. When you know the TOTAL and ONE PART, you can always use subtraction to find the other part! * 18 (Total) - 10 (Part 1) = 8 (Part 2). * So, there are 8 white bears!
Try it
Find the missing addend!
Instructions: Use the total and the part you know to find the part you don't know.
Problem 1: A baker makes 14 cupcakes in total. 6 are chocolate, and the rest are vanilla. How many are vanilla? * Total: 14. Part: 6. * Equation: 6 + ___ = 14 * Subtraction trick: 14 - 6 = ___ * Answer: ___ vanilla cupcakes.
Problem 2: There are 17 apples in a bowl. 9 are green, and the rest are red. How many are red? * Equation: 9 + ___ = 17 * Answer: ___ red apples.
Problem 3: You have a bag of 20 Legos. 15 are blue and the rest are yellow. How many are yellow? * Answer: ___ yellow Legos.