Write the missing number: 10 + ＿ = 50.
Write the missing number: 10 plus the missing number equals 50.
We can count in tens along our number line to help us find the missing number.
We need to start at 10 and add until we reach 50. Let’s count in tens: 10, 20, 30, 40. 10 plus 40 is 50.
The missing number is 40.
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