Subtraction

Subtraction Poem to learn important rules for subtracting

 Conclusion: His strategy is sound but his calculations are wrong. The answer should be 4358.

Challenge Question

Adding and Subtracting

Thinking about Numbers

This Math problem had us thinking deeply about numbers. Specifically adding consecutive numbers. We made some interesting discoveries:

- the sum of  two consecutive numbers will always results in an odd number

E.g. (2 + 3 = 5 ) 5 is an odd number, 2 and 3 follow each other. They are consecutive numbers. Try some more on your own to prove this theory!

- the sum of three consecutive numbers always results in a number that is divisible by 3

E.g. (4 + 5 + 6 = 15) 15 is divisible by 3.

Here's another discovery - you can simply multiply the middle number times 3 to find the total. In the example, 5 is the middle number. Multiply 5 X 3 and voila! The answer is 15. This works for any three consecutive numbers

Math is awesome, right?

More Discoveries

58 cannot be the sum of 5 or 6 consecutive numbers. It can, however, be the sum of 4 consecutive numbers 13 + 14 + 15 + 16 = 58

Students' Responses to question

Using place value understanding and properties of operations to perform multi-digit arithmetic

Students' Responses to Task. Good thinking kiddies 👍

Review and extra Practice for Math Test #1

Remember: Click on the arrows to go through the slides

Rounding Prices

Minds On Question

Modified Minds On Question

Students' Response

Notice the different strategies used by students. 

- Add all the prices, then round off the answer ($12, 479) to the nearest ten thousands ($12,000)

- Round off the total ($12, 479) to the nearest thousands, hundreds and tens
$12, 000  (1000s)                  $12, 500 (100s)                                 $12, 480 (10s)

- Round off each price individually then add to find the answer
$2,473 rounded off to the nearest thousands - $2,000
$6,923 rounded off to the nearest thousands - $7,000
$3,083 rounded off to the nearest thousands - $3,000

                                                              Total: $12,000