Mathematics
Grade 2
15 min
Add doubles - complete the sentence
Add doubles - complete the sentence
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1
Introduction & Learning Objectives
Learning Objectives
Identify a doubles fact.
Explain that 'double' means adding a number to itself.
Solve addition sentences for doubles from 1+1 to 10+10.
Complete a sentence that asks for a double, like 'Double 4 is ___.'
Write their own 'add doubles' number sentence.
Recall at least five doubles facts from memory.
Have you ever seen twins? π―ββοΈ They are a double! What happens when we double numbers?
Today, we will learn a super-fast math trick called doubles! β¨ We will add a number to itself. This helps us solve problems and complete sentences very quickly.
Real-World Applications
Counting pairs of socks 𧦠+ π§¦
Sharing cookies with a friend so you both have the same amount πͺ + πͺ
Figuring out how many legs two cats have π + π...
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Key Concepts & Vocabulary
TermDefinitionExample
DoubleA double is two of the exact same number added together.Double 3 is the same as 3 + 3. πππ + πππ
AddTo add means to put numbers together to find the total.We add 5 and 5 to get 10. ποΈ + ποΈ
SumThe sum is the answer you get when you add numbers.In 4 + 4 = 8, the sum is 8. ππππ + ππππ = 8 cars
Equal Sign (=)The equal sign means 'is the same as'.2 + 2 = 4 means 2 + 2 is the same as 4. β
Number SentenceA number sentence is a math problem with numbers and signs.6 + 6 = 12 is a number sentence. πΈπΈπΈπΈπΈπΈ + πΈπΈπΈπΈπΈπΈ = 12 frogs
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Core Formulas
The Doubles Addition Rule
number + same number = sum
To find a double, you just add a number to itself. This is the main pattern for all doubles facts.
The Sentence Completion Rule
'Double [number] is ___' means '[number] + [number] = ___'
When a sentence asks for a 'double', it's a secret code! It's telling you to add the number to itself to find the answer.
4 more steps in this tutorial
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Challenging
The sentence is ___ + ___ = 12, and the two missing numbers are the same. What would be the number sentence for the next double up?
A.6 + 6 = 12
B.7 + 7 = 14
C.8 + 8 = 16
D.5 + 5 = 10
Challenging
We know double 5 is 10 and double 4 is 8. The sentence to find the difference between these two doubles is 10 - 8 = ___.
A.2
B.4
C.18
D.1
Challenging
A recipe needs 2 cups of flour. You double it, so the sentence is 2 + 2 = 4. If you double the recipe AGAIN, what is the new sentence for the total flour?
A.2 + 2 = 4
B.3 + 3 = 6
C.6 + 6 = 12
D.4 + 4 = 8
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