Difference between revisions of "Bead Bars: Sums greater than Ten"
From wikisori
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=== Materials === | === Materials === | ||
| − | *Ten bars | + | *Ten bars |
| − | *Colored bead bars | + | *Colored bead bars |
*Box of signs for operations<br> | *Box of signs for operations<br> | ||
| Line 15: | Line 15: | ||
=== Presentation === | === Presentation === | ||
| − | #The child combines two or more numbers, whose sum will be greater than ten. | + | #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. | + | #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. | #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. | + | #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 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. | + | #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. | ||
<br> | <br> | ||
Latest revision as of 03:51, 15 October 2009
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
