Questions & Answers

Subtraction without and with Regrouping

100

Subtract 856 by 413 using the usual way

  856

- 413

  443

200

Subtract 954 by 532 using expanded form

  954 = 900 + 50 + 4

- 532 = 500 + 30 + 2

         = 400 + 20 + 2

         = 422

300

Subtract 587 by 342 using vertical subtraction

  587

- 342

   200

     40

    + 5

    245

400

Subtract 9 547 by 658 using the usual way with regrouping

9 547

-  658

8 889

500

Subtract 5 346 by 2 718 using the usual way with regrouping

  5 346

- 2 718

  2 628

Estimation

100

Estimate the difference of 874 and 418

  900

- 400

  500

200

Estimate the difference of 521 and 315

  500

- 300

  200

300

Estimate the difference between 7 230 and 1 798

  7 000

- 2 000

  5 000

400

Estimate the difference between 2 745 and 563

2 800

-  600

2 200

500

Estimate the difference between 4 844 and 788

4 800

- 800

4 000

Mental Subtraction (1-2 digit numbers)

100

Mentally subtract 74 and 30

  74

- 30

  44

200

Mentally subtract 74 and 44

  74

- 44

  30

300

Mentally subtract 67 and 42

   60         7

- 40       - 2

    20   +    5  

= 25

400

Subtract 54 and 27, expressing the subtrahend in multiple of 10

  54

- 30

  24

+  3 

  27

500

Mentally subtract 90 and 56 using the appropriate strategy

30 + 60

 -      56

30  +  4 

= 34

Mental Subtraction (2-3 digit numbers)

100

Mentally subtract 986 and 600

  986

- 600

  386

200

Mentally subtract 875 and 575

  875

- 575

  300

300

Mentally subtract 968 and 734.

  900        60      8

- 700     - 30    - 4

    200  +   30  +  4  

= 234

400

Subtract 722 and 294, expressing the subtrahend in multiples of 100.

  722

- 300

  422

  + 6

  428

500

Mentally subtract 500 and 196 using the appropriate strategy

300 + 200

 -        196

300 +  4  

= 304

Word Problem Involving Subtraction

100

The Drama Club has 900 tickets for their school play, 270 of which are set aside and considered sold. How many more tickets are for sale?

Bonus points

100 Bonus Points

200

The Drama Club has 900 tickets for their school play, 270 of which are set aside and considered sold. How many more tickets are for sale?

• What are given?

900 - total number of tickets for the school play

270 -  tickets considered sold

300

The Drama Club has 900 tickets for their school play, 270 of which are set aside and considered sold. How many more tickets are for sale?

• What is asked?

• Number of tickets that are for sale

400

The Drama Club has 900 tickets for their school play, 270 of which are set aside and considered sold. How many more tickets are for sale?

• What is the operation to be used?
• What is the number sentence?

• Subtraction
• 900 – 270 = n

500

The Drama Club has 900 tickets for their school play, 270 of which are set aside and considered sold. How many more tickets are for sale?

• Solve for the answer
• What is the final answer?

• 600 +  300

     -         270

      600  +  30 

       = 630

• There are 630 tickets that are for sale.