How many groups are there? Tell a story about the groups. 2. Complete drawings and multiplication and division sums of the following.

Here are the solutions for the grouping problems:

1. How many groups are there?

• First image (green blocks, 4 rows of 3):

  • Groups: $\boxed{4}$
  • Addition sum: $3 + 3 + 3 + 3 = \boxed{12}$
  • Multiplication sum: $4 \times 3 = \boxed{12}$
  • Division sum: $12 \div 4 = \boxed{3}$

• Second image (green blocks, 3 rows of 4):

  • Groups: $\boxed{3}$
  • Addition sum: $4 + 4 + 4 = \boxed{12}$
  • Multiplication sum: $3 \times 4 = \boxed{12}$
  • Division sum: $12 \div 3 = \boxed{4}$

• Third image (long green blocks, 5 rows of 10):

  • Groups: $\boxed{5}$
  • Addition sum: $10 + 10 + 10 + 10 + 10 = \boxed{50}$
  • Multiplication sum: $5 \times 10 = \boxed{50}$
  • Division sum: $50 \div 5 = \boxed{10}$

• Fourth image (red squares, 3 groups of 2):

  • Groups: $\boxed{3}$
  • Addition sum: $2 + 2 + 2 = \boxed{6}$
  • Multiplication sum: $3 \times 2 = \boxed{6}$
  • Division sum: $6 \div 3 = \boxed{2}$

2. Complete drawings and multiplication and division sums of the following:

• 4 groups of 2 each:

  • Drawing: Draw 4 separate groups, with 2 items in each group (e.g., || || || ||).
  • Multiplication sum: $4 \times 2 = \boxed{8}$
  • Division sum: $8 \div 4 = \boxed{2}$

• 5 groups of 2 each:

  • Drawing: Draw 5 separate groups, with 2 items in each group (e.g., || || || || ||).
  • Multiplication sum: $5 \times 2 = \boxed{10}$
  • Division sum: $10 \div 5 = \boxed{2}$

• 4 groups of 10 each:

  • Drawing: Draw 4 separate groups, with 10 items in each group.
  • Multiplication sum: $4 \times 10 = \boxed{40}$
  • Division sum: $40 \div 4 = \boxed{10}$

• 2 groups of 100 each:

  • Drawing: Draw 2 separate groups, with 100 items in each group.
  • Multiplication sum: $2 \times 100 = \boxed{200}$
  • Division sum: $200 \div 2 = \boxed{100}$

• 6 groups of 100 each:

  • Drawing: Draw 6 separate groups, with 100 items in each group.
  • Multiplication sum: $6 \times 100 = \boxed{600}$
  • Division sum: $600 \div 6 = \boxed{100}$

Division sums for "shared between" problems:

• 8 shared between 4:

  • Division sum: $8 \div 4 = \boxed{2}$

• 10 shared between 4:

  • Division sum: $10 \div 4 = \boxed{2 \text{ remainder } 2}$

• 40 shared between 4:

  • Division sum: $40 \div 4 = \boxed{10}$

• 200 shared between 2:

  • Division sum: $200 \div 2 = \boxed{100}$

• 600 shared between 6:

  • Division sum: $600 \div 6 = \boxed{100}$