Measuring segments; segment addition
- Two answers for one segment — 3 tasks
- Distance when the coordinates are negative — 3 tasks
- When the parts make the whole — 3 tasks
- Finding the piece that is missing — 3 tasks
- The algebra behind the addition — 9 tasks
- Practice — 26 tasks
- Summary — 2 tasks
- Cool-down — 3 tasks
Classroom activities
Things a class does rather than writes on. Each one is a finished PDF: print it, cut it up if it says so, and hand it round.
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Segment Addition — Cut & Glue Sort 25 minutes, including the cutting · 5 sheets
12 pieces, each asking for one length, sorted without any arithmetic into add the pieces, take a piece from the whole, or it cannot be found — where the last row holds a bent path, a missing three-letter name, a piece nobody measured and a point off the line.
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Measuring Segments & Segment Addition — Answer Maze 10–15 minutes · 4 sheets
One page and nothing to prepare: 8 boxes, each asking for one length — off a ruler that does not start at 0, on a number line with negative coordinates, or on a lettered line — where the wrong number is the mistake the lesson exists to stop and leads to a box that sends you back.
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Segment Addition — Mystery Picture 25–35 minutes · 4 sheets
25 figures and not one number: lettered points on a straight stroke, on a bent path, or on two strokes that cross, each with an equation among their lengths — fill the square where the figure makes the equation true, and a picture appears.
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Measuring Segments & Segment Addition — Scavenger Hunt a full class period · 13 sheets
16 cards round the room: a ruler that does not start at 0, two points on a number line with negative coordinates, pieces and wholes on a lettered line — each asks for one length, a wrong answer lands on a card that sends the group back, and a clean run is 8 lines on the record sheet.