In class we learned a "trick" when multiplying by 11. Try some more numbers to see if it always works. Share with your parents. Here is how we did it.
To multiply a two-digit number by 11, first write the two digits of the number in the answer space, but leave a space in the middle of the two digits. Then add the two digits together. Write that sum in the space you left between the original two digits.
PROBLEM: 63 x 11
Step 1: Write the number 63 in the answer space, leaving
a space in the middle. 6_3
Step 2: Add the 6 and the 3 6 + 3 = 9
Step 3: Place the sum (9) between the 6 and the 3. 693
If you have to "carry", this is what you do...
PROBLEM: 76 x 11
Step 1: Write the number 76 inthe answer space,
leaving a space in the middle 7_6
Step 2: Add the 7 and the 6 7 + 6 = 13
Step 3: Place the ones digit of the sum (3) between
the 7 and the 6 736
Step 4: Add 1 to the hundreds digit (the 7) 836
Mrs. Weisser
About Me
- Mrs. Weisser
- I have been teaching for the Salem-Keizer School District since 1982. I love learning and watching my students learn to love it too. My mother taught me a rhyme that I share each year with my students. It goes like this: Good, better, best. Never let it rest, until the good is better and the better is best. We strive to always to our best.