Continue with Microsoft TeamsOntario Curriculum Expectation:
2.C2.1 identify when symbols are being used as variables, and describe how they are being used.
A variable is a symbol such as a letter or question mark that represents a number we do not know.
Example 1:
Sammy has 4 cookies. Then, he buys more cookies. Sammy now has 7 cookies.
The question mark represents the unknown number of cookies Sammy buys.
Example 2:
Anne has 9 strawberries. Then, she ate some of the strawberries. Anne has 5 strawberries left.
The letter ‘S’ represents the unknown number of strawberries Anne ate.
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1 of 101. Question
1. What is the variable in the number sentence?
   6 − ? = 1
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2 of 102. Question
2. What is the variable in the number sentence?
   ? + 6 = 8
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3 of 103. Question
3. What is the variable in the number sentence?
   7 + S = 12
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4 of 104. Question
4. What is the variable in the number sentence?
   B − 4 = 5
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5 of 105. Question
5. Choose the correct number sentence for the scenario.
   Jada counts her animal stickers. She has 15 animal stickers. She gives some stickers to Alice. Now Jada has 8 stickers. How many stickers did Jada give to Alice?
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6 of 106. Question
6. Choose the correct equation for the scenario.
   Troy is selling brownies. Troy has sold 6 brownies that are $1 each. How many more brownies does he need to sell to have $12?
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7 of 107. Question
7. Choose the correct equation for the scenario.
   Megan has $18, then she buys a new toy. Now she has $4 left over. How much did the toy cost?
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8 of 108. Question
8. Choose the correct equation for the scenario.
   Leo has 9 playing cards. Erik has playing cards too. Together they have 22 playing cards.
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9 of 109. Question
9. Choose the correct equation for the scenario.
   Mary is 8 years old. The sum of her age and her brother Devin’s age is 18. How old is Devin?
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10 of 1010. Question
10. Choose the correct equation for the scenario.
    Sasha is saving up to buy a new sweater. She has $12 and her mom gave her $8. The sweater Sasha wants is $35. How much more money does Sasha need to save?
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