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In this lesson, we will learn how to choose the most appropriate strategy to add within 20 and identify equivalent expressions equal to the same number.
Q1:
Rania was asked to solve .
She wrote
Is her solution correct?
Q2:
Calculate 5 + 8 .
Q3:
What is 7 add 13?
Q4:
Ramy and Rania are trying to find 8 + 9 .
Ramy uses the fact that 8 + 8 = 1 6 and says that 8 + 9 = 1 6 + 1 .
Rania uses the fact that 9 + 9 = 1 8 and says that 8 + 9 = 1 8 − 1 .
Who is correct?
Q5:
Find the smallest two digit number whose digits add up to 8.
Q6:
Aisha tried to solve by using the doubling numbers facts, but she got the answer wrong.
Her teacher circled the mistake in her answer. Help her by finding .
Q7:
Fady was asked to solve 6 + 5 .
He wrote
Is his solution correct?
Q8:
George tried to solve by using the making ten strategy, but he got the answer wrong.
Q9:
Calculate 1 2 + 6 .
Q10:
Think about adding 8 and 7.
One of the equations is WRONG. Which one is it?
Q11:
Sally tried to solve by using the doubling numbers facts, but she got the answer wrong.
Q12:
This is an addition machine. It adds six to any number you put in.
What number will you get if you put 3 in?
What number will you get if you put 12 in?
Q13:
Which of these is NOT equal to 15?
Q14:
Shady was asked to solve .
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