Weds 15th June – Subtracting one 4 digit number from another 4 digit number

LEARNING Objective: Develop methods to enable you to subtract large numbers

SUCCESS CRITERIA: You will be able to subtract one large number from another large number correctly.

STARTER: Use Just in Time first for single digit subtraction and then double digit subtraction – give 5 seconds for dingle digit and 12 seconds for double digit (10- sums of each)

LESSON:

For these 2 digit numbers split them into sums, adding a tens number to a number bigger than 10 but less than 20

Eg

87 = 70 + 17	65 = 50 + 15
38 = 20 + 18	93 = 80 + 13

 
 

Can you do the same with these two digit numbers

43	57	86	94	38
28	88	79	91	56

 
 

Can you now do the same with these 3 digit numbers?

Eg

304 = 290 +14

208 = 190 + 18

507	602	203
404	109	208

 
 

 
 

How do we set about doing this sum 457 – 329 – Look at different methods of working out the answer on the IWB developing the long subtraction method

Get Students to try and subtract these sums

435 -214	657 – 434	673 – 548
876 – 687	564 – 359	3456 – 2445
7865 – 6548	4563 – 3274	2307 - 269
6503 – 2428	7005 – 4567	9008 - 5769

 
 

Use your calculator now to check your answers

Subtraction Crossword Puzzle

PLENARY: Feedback from students on subtraction