1. Adding and Subtracting Decimals PEER Program Texas A & M University

2. Random Decimal Fact The decimal system used in currency today was proposed by Thomas Jefferson. But his proposal to establish standard weights and measurements was rejected.

3. 2.2 cm (2 cm + 2 mm ) 4.7 cm ( 4 cm + 7 mm ) Find the total length of these two lizards.

4. + 2.2 cm 4.7 cm To get their total length, we set up the addition so that the decimal points LINE UP!. Add each digit and then write the units (centimeters). 6.9 cm

5. ) 1234567891011 in 1234567891011 in 3.5 in 1.625 in 1 8 5 () 3 2 1 ( Now, how much longer is the big lizard than the small lizard, measured in inches?

6. - 1.625 in 3.5 in. Now, we have to put the longer lizard length minus the shorter. Align the decimal points in all the numbers!

7. - 1.625 in 3.500 in. For any numbers that are shorter, fill in the rest of the digits with 0’s. 1.875 in

8. Find the difference between 2. 12.508 and 3.7 3. 1.08 and 0.71226 Find the sum of 4. 2.004 and 319.7 1. 5.09 and 0.009 Practice Problems

9. Andrew wants a new bike that costs $89.99. He had $14.83 in his savings account. Today, he deposited $22.49 into his account. 1. How much money does Andrew have in his account now? 2. How much more money does he need in order to buy the bike? $89.99

10. Grocery spending for the last four weeks Week1234 Amount Spent $ 52.3577.9742.7490.12 Mrs Henry’s grocery spending for the last four weeks is shown below. 1. How much total has she spent on groceries in the last four weeks? 2. What is the difference between her largest and her least grocery spending?

11. Fact Finding Activity Hypothesis Taller people have longer fingers? TRUEFALSE Go to activity sheet!

12. Fact Finding Activity What is the length of your middle finger in cm? What is the total length of your three fingers in cm? How much taller is your middle finger than your index finger? Go to activity sheet!