When first learning mental addition, start by writing the result a few times until you get the hang of the method. When teaching mental addition, we recommend trying to hold the first result in your head whilst carrying out the next part of the calculation. The answer ends in a 2 because 12 ends in a 2. This means that we increase the tens column by 1 and our answer ends in a 2. The first step to adding two 2-digit numbers mentally is to add the digits in the tens column. In this next example we have the mental addition of the 2-digit numbers 44 + 28. This is because adding 11 is the same as adding ten and then adding 1.īecause 11 ends in a 1, we know that our digit in the units column of our answer is also a 1. The next step is to add the digits in the units column.ġ1 is larger than 10 and so, we need to add 1 to our result from adding the tens column. The first step is to add the digits in the tens column. To add 2-digit numbers, it is first worth knowing the following 1-digit additions: We only hold the result of the tens column in our head while we add the units column. The units column of the units column result is the units digit of your answer.If this result is larger than ten then add one to your tens column answer from before.Add the digits in the units column together.Add the digits in the tens column together and remember this result.To do mental addition, use the following steps: The fewer the steps, the better the method as it is easier to hold the numbers in your head. There are various strategies for mental addition, however, with each method, it is important to hold values in your head. All of the calculations are done in your head. Mental addition means to add numbers in your head without writing down any steps or notes as part of the calculation.
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