Grade Level: 3rd Skill: Fractions and Probability Topic: Add and Subtract Fractions Goal: Add and subtract simple fractions (e.g., determine that 1 - 8 + 3 - 8 is the same as 1 - 2). Skill Description: Number Sense: Add and subtract fractions The ability to add and subtract fractions with like denominators. The ability to reduce simple fractions to the lowest form.

### Sample Problems

 (1) Define simplest form. (the only common factor (what can be multiplied to get the number) in the numerator and denominator is 1). (2) What part of the fraction is added or subtracted? (the top/numerator) (3) The higher the number under the fraction line, the (bigger or smaller) the piece? (smaller) (4) What does the fraction line mean? (divided by) (5) Reminder: the bottom number names how many pieces a unit has been divided into and the top number names how many of those pieces are being used, or are involved.

### Online Resources

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### Extra Help Problems

 (1) Color 1/4 red and 2/4 blue. What fraction did you color in all? (2) Color 2/8 purple and 2/8 green. What fraction did you color in all? (3) Shaded fractional circles. Child determines which is greater or lesser than. (4) 2/7 + 3/7 = (5/7) (5) 5/16 + 5/16 = (10/16) (6) 1/8 + 3/8 = (4/8) (7) 3/9 + 2/9 = (5/9) (8) 7/10 + _____= 9/10 (9) 10/10 – 1/10 = (9/10) (10) 4/5 – 2/5 = (2/5) (11) 6/8 – 3/8 = (3/8) (12) 7/9 - ______= 5/9 (13) The lower the number under the fraction line, the (bigger or smaller) the piece? (bigger) (14) Find ¼ of 16. (4) (15) Find ½ of 10 (5) What is ¼ of 16 + ½ of 10? (9) (16) Find 1/6 of 18 (3) (17) Find 1/10 of 100 (10) (18) Find 1/8 of 56 (7) (19) Find 1/3 of 21 (7) (20) Find 1/9 of 54 (6) (21) Find 1/7 of 49 (7) (22) What is ½ a day? (If ½ of 24 is 12, then half a day is 12 hours) (23) What is ½ a year? (If ½ of 12 is 6, then half a year is 6 months) (24) What is ½ a minute? (If ½ of 60 is 30, then ½ a minute is 30 seconds) (25) What is ½ a minute and ¼ of a minute? (30 + 15 = 45 seconds) (26) What is 1/7 of a week + 2/7 of a week? (3 days) (27) What fraction is 7/10 – 2/10? (5/10) 5/10 is the same as what other fraction? (1/2)