Math: Elementary School: 1st and 2nd Grade Quiz - Adding and Subtracting Two-Digit Numbers (Answers)
This Math quiz is called 'Adding and Subtracting Two-Digit Numbers' and it has been written by teachers to help you if you are studying the subject at elementary school. Playing educational quizzes is a fun way to learn if you are in the 1st or 2nd grade - aged 6 to 8.
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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.
Try this quiz to see how well you do with adding or subtracting two-digit numbers.
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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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Recognizing 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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