Practise adding two numbers. Count on, use number lines, and spot friendly tens to make sums quicker. Try simple steps that build confidence before bigger challenges.
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You can find more about this topic by visiting BBC Bitesize - Adding and subtracting
Adding the 10 and 10 up first, then adding the 9 might have helped
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Additions can be done in any order - putting the 15 first could be useful
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Starting with 27 and counting up in tens is a good option to try
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Partitioning means splitting up the tens and units, making this addition easier
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Adding up in any order will give the same answer
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Starting with the larger number and counting on might be a good plan
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Adding the 30 and 40 first and then adding on the units is a good strategy here
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Using the number bond of 7 and 3 might be useful
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Trying to make 10 and then counting on, or using a near double of 7 + 7 could have helped
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Addition calculations can be done in any order, but subtractions cannot
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