Two Tier Subtraction Exercise

Copyright © 2010 Golda Mowe,

Remember, if the number above is smaller than the number below, borrow ten.  For example in question (b), 3 is smaller than 7, so you borrow ten from 60 to make it 13.  Hence 13 - 7 = 6.  So then 6(ten) becomes 5(ten), that is because 63 = 50 + 13.  When you need to borrow 10 from a "0", that means you have to get 10 from 100.  For example in 102 = 90 + 12  Repeat where necessary.  When you are done, click Score Me to see how well you did. If you didn't get a 100%, return to the questions marked "X" and correct your answers. Then click on Score Me again. Repeat until you get all your answers correct.

a. 2026
—691

b. 1363
—1047

c. 2356
—1011

d. 1372
—548

e. 1405
—106

f. 1137
—203

g. 2066
—1032

h. 668
—258

i. 1179
—221

j. 1993
—766

   out of 10, which is % correct.

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