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Using a Chip Abacus to Show Subtraction

Using a Chip Abacus to Show Subtraction. Subtraction using a Chip Abacus. Hundreds. Tens. Ones. On your mat lay out the chips for the Minuend only. 249 - 25. Subtraction using a Chip Abacus. Hundreds. Tens. Ones. Now remove or take away 5 chips from the Ones column. 249 - 25.

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Using a Chip Abacus to Show Subtraction

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  1. Using a Chip Abacus to Show Subtraction

  2. Subtraction using a Chip Abacus Hundreds Tens Ones On your mat lay out the chips for the Minuend only 249 - 25

  3. Subtraction using a Chip Abacus Hundreds Tens Ones Now remove or take away 5 chips from the Ones column 249 - 25 Remove from the mat.

  4. Subtraction using a Chip Abacus Hundreds Tens Ones Remove or take away 2 chips from the Tens column 249 - 25 Remove from the mat.

  5. Subtraction using a Chip Abacus Read the answer on the mat, there are 2 in the Hundreds column, 2 in the Tens column and 3 in the Ones column. Hundreds Tens Ones • 249 • 25 • 223

  6. Subtraction using a Chip Abacus Hundreds Tens Ones On your mat lay out the chips for the Minuend only 121 - 25

  7. Subtraction using a Chip Abacus Since you do have enough chips in the Ones column to remove 5 chips you must move on of the chips in the Tens column over. Hundreds Tens Ones 121 - 25

  8. Subtraction using a Chip Abacus Now there are 11 chips in the Ones column. Hundreds Tens Ones 121 - 25

  9. Subtraction using a Chip Abacus Remove the 5 chips from the Ones column. Hundreds Tens Ones 121 - 25 Remove from the mat

  10. Subtraction using a Chip Abacus Now you need to remove 2 chips from the Tens column. Since there are not enough chips, one chip from Hundreds column will have to move over. Hundreds Tens Ones 121 - 25

  11. Subtraction using a Chip Abacus There are 11 chips in the Tens column. Remove the 2 chips from the Tens column. Hundreds Tens Ones 121 - 25 Remove from the matt.

  12. Subtraction using a Chip Abacus Now read the answer. There are 9 chips in the Tens column and 6 chips in the Ones column. Hundreds Tens Ones • 121 • 25 • 96

  13. Subtraction using a Chip Abacus Now you try these problems: 159 - 28 = 145 - 23 = 349 - 258 = 43 - 25 = 257 - 149 = 244 - 156 =

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