If your child needs a number line to help with adding and subtracting--here you go! A number line is a great strategy, but encourage your child to use more efficient strategies as the year progresses.
More efficient strategies for adding:
*instead of counting all the counters/numbers, say the larger number and then count on the smaller number
*use doubles and add on the rest (for example, 5+4 is close to the double 5+5, I know that 5+5=10, so 5+4 has to be 9 because 4 is one less than 5)
*look for combinations that make 10 (for example, 7+4 is close to the 10 Friend 7+3, I know that 7+3=10 so 7+4 has to be 11 because 4 is one more than 3)
More efficient strategies for subtracting:
*if a zero is being subtracted, the first (larger) number will not change
*if a small number is being subtracted (a 1, 2, or 3), count backwards from the bigger number
*if the difference between the numbers isn't too large (like 12-7), say the smaller number and count up to the larger number
*relate known addition facts to subtraction facts (for example, I know that 3+7=10 so 10-7 will equal 3)
More efficient strategies for adding:
*instead of counting all the counters/numbers, say the larger number and then count on the smaller number
*use doubles and add on the rest (for example, 5+4 is close to the double 5+5, I know that 5+5=10, so 5+4 has to be 9 because 4 is one less than 5)
*look for combinations that make 10 (for example, 7+4 is close to the 10 Friend 7+3, I know that 7+3=10 so 7+4 has to be 11 because 4 is one more than 3)
More efficient strategies for subtracting:
*if a zero is being subtracted, the first (larger) number will not change
*if a small number is being subtracted (a 1, 2, or 3), count backwards from the bigger number
*if the difference between the numbers isn't too large (like 12-7), say the smaller number and count up to the larger number
*relate known addition facts to subtraction facts (for example, I know that 3+7=10 so 10-7 will equal 3)
Number Lines.pdf | |
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