Bead Bars: Sums greater than Ten
From wikisori
Contents
Age
4-6
Materials
- Ten bars
- Colored bead bars
- Box of signs for operations
Preparation
Command cards may be made.
Presentation
- The child combines two or more numbers, whose sum will be greater than ten.
- The colored bead bar is placed below the ten bar to facilitate counting.
- For example:A child chooses 14 and 12 in beads to add.
- Tell the child to add the units first and then the tens to achieve the sum: 4 + 2 = 6 and 2 tens are twenty.
- The sum is 26.
- The child chooses 18 + 25 in beads.
- Again units are added first. Since that sum is 13.
- Place a three bar below and carry the one ten mentally.
- Carrying the one ten add the other tens.
- The sum is 4 tens and the total sum is 43.
Control Of Error
The chart.
Points Of Interest
Purpose
- To give a child experience with horizontal as well as vertical addition.
Variation
Links
Handouts/Attachments
