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Secret Number

Age 5 to 7 Challenge Level:

Annie added $4$ to her number and it made $10$. What number added to $4$ makes $10$?
How could you check your answer?
When Charlie "timesed" his number by $5$, it came to $35$. What number multiplied by $5$ makes $35$?
How could you check your answer this time?
You could use a number line or a multiplication square to help you.