# Math Lesson Plan: Pumpkin Addition and Subtraction

This is a great spare-time or centre activity for practising adding and subtracting.  The pumpkin faces are easy to make and program with the number sentences that you want students to practise.  Students may help to cut out more pumpkins when needed and the teacher can print new number sentences on them.  They may even be taken home for practise.   **This can be adapted for multiplication or division use.  ***Other seasonal ideas for using this concept include Santa faces, snowmen faces, Easter bunny faces, Valentine heart faces, March leprechaun faces.

Objective:

1. practising addition number sentences to mastery
2. practising subtraction number sentences to mastery

Materials:

1. orange construction paper, cut into 8 1/2″ X 11″ sheets  (These will be fed into copy machine to make pumpkin faces from Halloween Pumpkin Worksheet.)
2. Halloween Pumpkin Worksheet showing 6 different pumpkin faces  (see below).  Print out a white master copy on an 8 1/2″ X 11″ sheet.
3. white 8 1/2″ X 11″ sheets to use as backing for orange pumpkins (number sentences will be printed on these)
4. fine black-tip Sharpie marker
5. scissors
6. X-Acto knife
7. glue stick

Method:

1. I make a master worksheet of 6 different black outlined pumpkin faces, each with 2 eyes and a mouth, on white 8 1/2″ X 11″ paper.  This has been done for you.   (See below for my Halloween Pumpkin Worksheet.)
2. I cut the orange construction paper into 8 1/2″ X 11″ size, for as many pumpkins as I want to make, maybe 5 or 10 copies to start (makes 30 or 60 pumpkins).
3. With the white master Worksheet under the lid, photocopy pumpkin faces onto the orange paper, feeding the orange sheets in one at a time.
4. Cut out pumpkin shapes with scissors.  (It’s easiest if the white backing sheet is temporary attached to the printed orange pumpkin faces page, so both the orange front and white backing of the pumpkins are cut out at the same time.  Separate front and back before you cut out the eyes on the orange pumpkins.)
5. Use X-Acto knife to cut open eye and mouth flaps.
6. Glue outside edge of the orange pumpkins onto the white pumpkin backings.
7. Teacher prints number sentence on each pumpkin.  (See below for a sampling of lists for addition and subtraction number sentences that can be used.  For example, 3 goes on left eye, 9 goes on right eye and the answer 12 goes on the mouth.  Students open the left eye and say “3 plus” then open the right eye “9 equals”, then answers “12” before opening the mouth flap and checking their answer.)  I put “+” or “-” on the pumpkin stem to make it easier to “say” the number sentences.  Example:  3 “plus” 9 equals 12.
8. Teacher demonstrates how to use the pumpkins, stressing the importance of SAYING the number sentence out loud and figuring out the answer BEFORE opening the mouth flap to CHECK their answer (for reinforcement).
9. Check for class knowledge level before printing up pumpkins.  Some classes may not need the 1+…  whereas others may need to begin there.

**See below for Halloween Pumpkin Worksheet and the beginning of a list of number sentences for addition and subtraction.  Lists like this can be found in “The Elementary Math Teacher’s Book of Lists: With Ready-to-Use Patterns and Worksheets ” (page 131 has 100 basic addition facts, page 132 has 100 basic subtraction facts, see pages 133 and 134 for multiplication and division facts).  Teachers will test the students for prior knowledge and begin where needed and review where needed.

Halloween Pumpkin Worksheet (PDF) – print on white paper for master copy

Beginning of a list of Number Sentences for Addition:

Zero Facts:
0+0=0   1+0=1   2+0=2   3+0=3   4+0=4   5+0=5     6+0=6     7+0=7    8+0=8    9+0=9 …

Plus One Facts:
0+1=1     1+1=2     2+1=3     3+1=4     4+1=5     5+1=6     6+1=7     7+1=8    8+1=9    9+1=10 …

Double Facts:
0+0=0     1+1=2     2+2=4     3+3=6     4+4=8     5+5=10     6+6=12     7+7=14    8+8=16    9+9=18 …

Double Facts Plus One:
0+1=1     1+2=3     2+3=5     3+4=7     4+5=9     5+6=11     6+7=13    7+8=15    8+9=17 …

Beginning of a list of Number Sentences for Subtraction:

Zero Facts:
0-0= 0    1-0=1     2-0=2     3-0=3     4-0=4     5-0=5     6-0=6     7-0=7    8-0=8    9-0=9  …

Minus One Facts:
1-1=0     2-1=1     3-1=2     4-1=3     5-1=4     6-1=5     7-1=6     8-1=7    9-1=8    10-1=9 …

Subtract Half:
2-1=1     4-2=2     6-3=3     8-4=4     10-5=5     12-6=6     14-7=7    16-8=8    18-9=9 …

Other Facts:
1-1=0     3-2=1     5-3=2     7-4=3     9-5=4     11-6=5     13-7=6    15-8=7    17-9=8 …