Three Tier Subtraction Exercise

Copyright © 2010 Golda Mowe,

There are many ways to do this such as solve the first two tier, then use the result to subtract the third tier from. Another way is to add the two bottom tier together then subtract the result from the top tier. Else you can do all three at one go.

My favorite technique is the second one because for a three-tier, I may need to borrow 2(tens) sometimes and adding the bottom two numbers together is the quickest way to decide. In this case, a borrow becomes,

63 = 40 + 23 and 102 = 80 + 22

a. 1164
552
—491

b. 1760
761
—715

c. 1956
408
—992

d. 1602
586
—826

e. 2478
1013
—762

f. 1216
255
—548

g. 1754
859
—126

h. 1380
409
—477

i. 698
471
—163

j. 2067
726
—907

   out of 10, which is % correct.

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