Question

6 jan circled the problems that she cannot solve in her head by making a ten. 14 - 7 8 - 2 12 - 8 9 - 4 15 - 6 look at all of the problems. why doesn’t jan make a ten to solve the circled problems?

Explanation:

Step1: Understand making - a - ten strategy

The making - a - ten strategy is useful for addition and subtraction problems where one can break numbers to get to 10. For example, in 14 - 7, we can break 7 into 4 and 3, then 14-4 = 10, and 10 - 3=7.

Step2: Analyze non - circled problems

For 14 - 7, we can use making - a - ten. For 12 - 8, we can think of 12 as 10+2 and 8 as 2 + 6, 10-(8 - 2)=4. For 15 - 6, we can break 6 into 5 and 1, 15-5 = 10, 10 - 1 = 9.

Step3: Analyze circled problems

The problems 8 - 2 and 9 - 4 are simple single - digit subtraction problems. They are straightforward and do not require making a ten to solve mentally. We can directly subtract the second number from the first.

Answer:

The circled problems 8 - 2 and 9 - 4 are simple single - digit subtraction problems that can be solved directly without the need to break numbers to make a ten.