## Tuesday 13 January 2015

### Montessori Activity: Static Subtraction Without Golden Beads - Vertical Presentation

Age: From 5.5 years old

Materials:
1. Subtraction worksheets
2. Pencil and eraser

Directions:
1. Start with single digit subtraction questions.

2. Show your child how to read the question by reading it to your child. E.g.

5
- 3
-----
?
-----

(You could also show him the horizontal presentation first, and then write it in vertical presentation, for him to see the relation)

3. If your child could not derive the answer mentally without golden beads, teach him to draw "o's" to represent the quantity in place of the golden beads. For example, draw 5 "o's", then ask your child to use the pencil to cross out 2 "ø's"

4. Ask your child how many "o's" are there left. Your child should answer 3. Ask your child to write the answer down.

5. Ask your child to read the question and the answer again.

6. Let your child try with the next single digit question.

7. Move on to double digit subtraction questions.

8. Show your child how to read the question from left to right E.g.

35
- 14
-----
?? <---
-----

9. Put an arrow to the left of the space where the unit place value shall be and explain that when answering addition problems, start from the unit place value.

10. Starting from the unit place value, ask the child, what is 5-4=? Your child should say 1. If he has difficulties, encourage him to draw 5 "o's" and cross out 4 "ø's"to represent each quantity next to the number.

11. Ask your child to write the answer "1" onto the unit place value answer space:

35
- 14
-----
?1 <---
-----

12. Move to the ten place value, and ask your child what is 3-1=? Your child should say2. If not, encourage your child to draw 3 "o's" and cross out 1 "ø" next to the respective number.

13. Explain that the answer "2" is at the ten value place, and thus it represent "20".

14. Ask your child to write the answer "4" onto the ten place value answer space.

35
- 14
-----
21 <---
-----
15. Ask your child to read the question and the answer again.

16. Let your child try with the next double digit question.

17. Do the same for the triple digit and quadruple digit addition questions.

Additional Information:
Our Little FECS (5Y10M8D) tried this for the first time today 13 Jan 2015. He could do the sum mentally and refuses to use the "o's". He could do it in Chinese, but he was not able to say the numbers in Danish and English. I will find opportunity to let him practise the hundred board using Danish and English.

The full curriculum and sequence of introduction is available from Brilliant Minds Montessori, which is available from Amazon:

 20 Jan 2015 (5Y10M15D) - Montessori Static Subtraction Without Golden Beads - Thousand Place Value - Vertical Presentation