Math: Elementary School: 1st and 2nd Grade Quiz - Adding and Subtracting One-Digit Numbers from Two-Digit Numbers (Answers)
This Math quiz is called 'Adding and Subtracting One-Digit Numbers from 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 one digit numbers from a two digit number follows on closely from the skill of adding and subtracting using only one digit numbers. At first, this calculating may rely on using equipment or fingers to check an answer, but will gradually progress to using only a number line and then perhaps visualizing that line mentally.
Try this quiz to see how well you add or subtract.
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This addition could be done in a different order to make it easier: 20 + 4
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Again, changing the numbers round makes the calculation easier, and still gives the same answer
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Knowing number bonds may help to recognize that 2 + 8 = 10
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Changing the units in the calculation to 58 + 1 might make it easier, and still gives the same answer
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Knowing number bonds to 20 is useful for subtractions such as this
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Try to picture this calculation as 34 - 4 - 1 to make it easier to calculate mentally
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Taking away 10 and then adding back a 1 is useful when subtracting 9
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Counting back in two jumps (of 5 and 2) makes this calculation easier
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Knowing number bonds well is useful in all sorts of calculations
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Counting up from 7 to 12 would give the same answer as counting back from 12 to 7
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