Maths Quiz - Year 2 Calculation - Addition and Subtraction of Two-Digit Numbers (Answers)
This quiz addresses the requirements of the National Curriculum KS1 Maths and Numeracy for children aged 6 and 7 in year 2. Specifically this quiz is aimed at the section dealing with adding or subtracting two, two-digit numbers.
Adding and subtracting two-digit numbers from two-digit numbers is a progression from adding or subtracting one-digit numbers. This obviously requires a higher level of skill, and many children may rely on using number lines or 100 squares to assist them.
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You can find more about this topic by visiting BBC Bitesize - Adding and subtracting
Partitioning the numbers into 40 + 20 and 4 + 3 is a useful strategy here
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Adding 30 to 54, and then taking away the extra 1 is a good strategy to use
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Recognising that 2 + 8 is a number bond which makes 10 might make things easier
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Doubling the tens and doubling the units gives the same answer
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Partitioning into tens and ones may be useful
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Again, partitioning numbers can prove useful
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Subtracting 20 is easier, but means one needs to be added back on
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Imagining this calculation in two jumps of - 30 and then -7 might make it more manageable
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Sometimes, counting up to find the difference is a good strategy when the numbers are quite close together
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You could check the answer is correct by adding 86 and 12 to check it's 98
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