3rd Grade Dividing Big Numbers by 12 Worksheet: Up to 144

The title spells "twelve" in words, but the problems use the number 12. Using the long division method with a two-digit number is new for most children. In 144 ÷ 12, they first ask how many twelves fit in 14. One fits, with 2 left over.

Then they bring down the 4 to make 24, and 24 ÷ 12 = 2, so the quotient is 12. Item e, 120 ÷ 12, follows the same path, but the key writes the last step as "00", where one 0 would do. A two-digit divisor is usually taught in fifth grade, so this page is a real stretch.

Dividing by 12 is the same as dividing by 2 and then by 6. Your child can test this on 72: half of 72 is 36, and 36 ÷ 6 = 6. Another path is to divide by 3 first, then by 4.

Knowing the 12 times table helps too, because 12 × 7 = 84 gives item f at once. Item d, 36 ÷ 12 = 3, is a good warm-up, so start there. Then move on to the two long items, a and b.

Draw six egg boxes on a sheet of paper, then ask your child how many boxes 72 eggs would fill, and how many 84 eggs would fill. Counting by twelves gives 6 and 7, matching items c and f. To finish, check each quotient against the answer key on page two.