Mathematics
Grade 2
15 min
Write the addition sentence - up to two digits
Write the addition sentence - up to two digits
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1
Introduction & Learning Objectives
Learning Objectives
Identify the two groups (addends) in a picture story.
Correctly use the plus sign (+) and equals sign (=).
Translate a picture or story problem into a number sentence.
Write a complete addition sentence with two-digit numbers.
Identify the parts (addends) and the whole (sum) in an addition sentence.
Explain what an addition sentence shows.
You have 14 red blocks 🟥 and 12 blue blocks 🟦. How can we write this down using numbers and signs? 🤔
Today, we will learn how to be math detectives! 🕵️ We will turn stories and pictures into cool addition sentences. This helps us show how we add numbers together.
Real-World Applications
Counting your toys in two different toy boxes 🧸.
Adding up the coins in your piggy bank 🐷.
Finding out how many friends a...
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Key Concepts & Vocabulary
TermDefinitionExample
Addition SentenceA math sentence that shows two or more numbers being added together. ➕15 + 10 = 25 is a complete addition sentence.
AddendThe numbers that you are adding together. They are the parts.In 21 + 30 = 51, the numbers 21 and 30 are the addends.
SumThe answer you get when you add numbers. It is the total or whole. 🌟In 21 + 30 = 51, the number 51 is the sum.
Plus Sign (+)A symbol that tells us to add. We say 'plus' or 'and'.We use it like this: 18 + 20.
Equals Sign (=)A symbol that means 'is the same as'. It shows us where the answer goes.We use it to show the total: 18 + 20 = 38.
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Core Formulas
The Addition Sentence Formula
Part + Part = Whole
This is the main pattern. You take one part, add another part, and it equals the whole amount.
The Addend and Sum Formula
Addend + Addend = Sum
This is the math way to say it. The numbers you add are addends, and the answer is the sum.
Order Doesn't Matter (Commutative Property)
a + b = b + a
You can switch the addends around, and the sum will stay the same! 25 + 10 is the same as 10 + 25.
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Challenging
There are 15 cars in the red parking lot. There are 12 more cars in the blue parking lot than in the red one. Which addition sentence finds how many cars are in the blue parking lot?
A.15 + 12 = 27
B.15 - 12 = 3
C.12 + 12 = 24
D.15 + 15 = 30
Challenging
The sentence is `45 + 20 = 65`. The story is: A farmer has 45 cows and 20 sheep. He sells 10 cows. Which question does the sentence answer?
A.How many animals did the farmer sell?
B.How many cows does the farmer have left?
C.How many animals does the farmer have in total?
D.How many more cows than sheep does he have?
Challenging
At the park, 16 children are on the swings and 21 children are on the slide. There are also 12 adults watching them from 4 benches. Which sentence shows the total number of children at the park?
A.16 + 12 = 28
B.16 + 21 = 37
C.21 + 12 = 33
D.16 + 21 + 12 = 49
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