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b. 6 tens + 0 ones = 5 tens + 1 ten + 0 ones

= 5 tens + 10 ones + 0 ones Regrouping
numbers in
= 5 tens + 10 ones subtraction is called
borrowing.

Exercise 3B

1. Break up a ten into 10 ones. What do you get? Draw and write.

a.

3 tens 0 ones tens ones

b.

tens ones tens ones

c.

tens one tens ones

2. Fill in the blanks.

a. 4 tens + 3 ones = _____ tens + 13 ones
b. 3 tens + 0 ones = 2 tens + _____ ones

c. 5 tens + 2 ones = _____ tens + 12 ones

3. First, write the numbers as tens and ones. Then, regroup.

a. 57 = _____ tens + _____ ones = _____ tens + _____ ones
b. 63 = _____ tens + _____ ones = _____ tens + _____ ones

c. 70 = _____ tens + _____ ones = _____ tens + _____ ones

4. Borrow 1 ten to make ones.

a. When 1 ten is borrowed to 3 ones, there are _____ ones.

b. When 1 ten is borrowed to 5 ones, there are _____ ones.

c. When 1 ten is borrowed to 6 ones, there are _____ ones.

53
Subtraction