Math strategy: Overshoot and Return
Math strand: Number sense and numberation
Location on the Addition and Subtraction Continuum:
Overview:
Overshoot and return is an example of a number-line related strategy. These strategies involve students keeping one number whole and then counting on or counting back. Students jump forward or backward to the nearest decade number, then take jumps of 10; or jump forwards or backwards by 10's from where they are. For example, to add 34 + 18 a child might think 34, 44, 54 (take mental jumps of 10) and land on 54 and subtract 2 to compensate for the 2 they added when making their initial jump of 20.
How this supports student learning:
As students encounter the challenge posed by adding or subtracting larger numbers, children will shift towards more efficient strategies. These strategies move along two general pathways, number-line related and splitting or decomposing strategies that lead to algorithms. Although there are two general pathways, number-line related strategies will only appear in classrooms that foster them.
Where to Next?
Games and activities that encourage Addition and Subtraction strategies involving jumps of 10 forward and backwards can be found in What to Look For by Alex Lawson on pages.
The page numbers for the games and activities that encourage addition and subtraction involving jumps of 10 forward and backward are missing from the page.
ReplyDeleteThe suggestions for Overshoot and return are found on page 101-102 after the video write up for Endrias. Suggestions to work with overshoot and return include: Tens and Ones Piggy Bank War (page 179) and Tens Salute (p.180)
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