SlideServe
Télécharger Obtenir Pro
Menu
Accueil Pro
Préférences
ApparenceLight Aide et commentaires
© SlideServe · v2026

3-3

ebuchanan avatar
ebuchanan
20 diapositives · 238 Views · Jan 04, 2020

Practice adding and subtracting decimals with real-life examples and helpful hints in this comprehensive online course.

#3-3 #3-3 ppt #powerpoint #presentation
3-3 - slide 1
01 / 203-3
1 / 17

Télécharger la présentation

3-3
Une image / un lien ci-dessous est fourni (tel quel) pour télécharger la présentation

Politique de téléchargement : le contenu du site vous est fourni TEL QUEL pour votre information et votre usage personnel ; il ne peut être vendu, concédé sous licence ni partagé sur d’autres sites sans l’accord de son auteur.Le contenu vous est fourni TEL QUEL, pour votre information et votre usage personnel uniquement. Téléchargez la présentation en cliquant sur ce lien. Lors du téléchargement, si vous ne parvenez pas à télécharger une présentation, l’éditeur a peut-être supprimé le fichier de son serveur.Pendant le téléchargement, si vous ne parvenez pas à obtenir une présentation, le fichier a peut-être été supprimé par l’éditeur.

F I N

Plus de contenu associé

Transcription de la présentation

  1. 3-3 Adding and Subtracting Decimals Course 1 L-1a Warm Up Problem of the Day Lesson Presentation

  2. 3-3 Adding and Subtracting Decimals Course 1 Warm Up Estimate by rounding to the indicated place value. 1.70.27 + 15.36; ones 2. 84.37 – 21.82; tenths Estimate each product or quotient. 3. 27.25  8.7 4. 44.52 ÷ 3.27 85 62.6 270 15

  3. 3-3 Adding and Subtracting Decimals Course 1 Problem of the Day Find a three-digit number that rounds to 440 and includes a digit that is the quotient of 24 and 3. Is there more than one possible answer? Explain your thinking. 438; no; the numbers that round to 440 are 435-444, 24 divided by 3 is 8, and 438 is the only number with 8 as a digit.

  4. 3-3 Adding and Subtracting Decimals Course 1 Learn to add and subtract decimals.

  5. 3-3 Adding and Subtracting Decimals Helpful Hint Estimating before you add or subtract will help you check whether your answer is reasonable. Course 1

  6. 3-3 Adding and Subtracting Decimals Course 1 At the 2004 U.S. Gymnastics Championships, Carly Patterson and Courtney Kupets tied for the All-Around title. To find the total number of points, you add all of the scores.

  7. 3-3 Adding and Subtracting Decimals Estimate by rounding to the nearest whole number. The total is about 28 points. Course 1 Additional Example 1A: Sports Application What was Carly Patterson’s total for the events other than the floor exercise? Find the sum of 9.7, 9.3, and 9.45. 9.7 + 9.3 + 9.45 10 + 9 + 9 = 28

  8. 3-3 Adding and Subtracting Decimals Align the decimal points. Use zeros as placeholders. Add. Then place the decimal point. Course 1 Additional Example 1A Continued Add. 9.70 9.30 +9.45 28.45 Since 28.45 is close to the estimate of 28, the answer is reasonable. Carly Patterson’s total for the events other than the floor exercise was 28.45.

  9. 3-3 Adding and Subtracting Decimals Align the decimal points. Use zeros as placeholders. Subtract. Then place the decimal point. Course 1 Additional Example 1B: Sports Application How many more points did Carly need on the vault to have a perfect score of 10? Find the difference between 10 and 9.3. 10.0 -9.3 0.7 Carly needed another 0.7 of a point to have a perfect score.

  10. 3-3 Adding and Subtracting Decimals Estimate by rounding to the nearest whole number. The total is about 29 points. Course 1 Check It Out: Example 1A What was Carly Patterson’s total for the events other than the vault exercise? Find the sum of 9.7, 9.7, and 9.45. 9.7 + 9.7 + 9.45 10 + 10 + 9 = 29

  11. 3-3 Adding and Subtracting Decimals Align the decimal points. Use zeros as placeholders. Add. Then place the decimal point. Course 1 Check It Out: Example 1A Continued Add 9.700 9.700 +9.450 28.850 Since 28.850 is close to the estimate of 29, the answer is reasonable. Carly Patterson’s total for the events other than the vault exercise was 29.85.

  12. 3-3 Adding and Subtracting Decimals Align the decimal points. Use zeros as placeholders. Subtract. Then place the decimal point. Course 1 Check It Out: Example 1B How many more points did Carly need on the uneven bars to have a perfect score of 10? Find the difference between 10 and 9.45. 10.00 -9.45 0.55 Carly needed another 0.55 of a point to have a perfect score.

  13. 3-3 Adding and Subtracting Decimals Think: 0.8 + 0.2 = 1. Think: What number added to 0.7 is 1? 0.7 + 0.3 = 1 So 1 – 0.7 = 0.3 Course 1 Additional Example 2: Using Mental Math to Add and Subtract Decimals Find each sum or difference. A. 1.8 + 0.2 B. 4 – 0.7 1.8 + 0.2 = 2.0 4 – 0.7 = 3.3

  14. 3-3 Adding and Subtracting Decimals Think: 0.6 + 0.4 = 1. Think: What number added to 0.3 is 1? 0.3 + 0.7 = 1 So 1 – 0.3 = 0.7 Course 1 Check It Out: Example 2 Find each sum or difference. A. 1.6 + 0.4 B. 6 – 0.3 1.6 + 0.4 = 2.0 6 – 0.3 = 5.7

  15. 3-3 Adding and Subtracting Decimals Substitute 3.8 for x. Align the decimal points. Use a zero as a placeholder. Subtract. Place the decimal point. Course 1 Additional Example 3A: Evaluating Decimal Expressions Evaluate 6.73 – x for each value of x. x = 3.8 6.73 – x 6.73 –3.8 6.73 – 3.80 2.93

  16. 3-3 Adding and Subtracting Decimals Helpful Hint You can place any number of zeros at the end of a decimal number without changing its value. Course 1

  17. 3-3 Adding and Subtracting Decimals Substitute 2.9765 for x. Align the decimal points. Use zeros as placeholders. Subtract. Place the decimal point. Course 1 Additional Example 3B: Evaluating Decimal Expressions Evaluate 6.73 – x for each value of x. x = 2.9765 6.73 – x 6.73 – 2.9765 6.7300 –2.9765 3.7535

  18. 3-3 Adding and Subtracting Decimals Substitute 3.8 for x. Align the decimal points. Use a zero as a placeholder. Subtract. Place the decimal point. Course 1 Check It Out: Example 3A Evaluate 7.58 – x for each value of x. x = 3.8 7.58 – x 7.58 – 3.8 7.58 –3.80 3.78

  19. 3-3 Adding and Subtracting Decimals Substitute 2.9765 for x. Align the decimal points. Use zeros as placeholders. Subtract. Place the decimal point. Course 1 Check It Out: Example 3B Evaluate 8.17 – x for each value of x. x = 2.9765 8.17 – x 8.17 – 2.9765 8.1700 – 2.9765 5.1935

  20. 3-3 Adding and Subtracting Decimals Course 1 Insert Lesson Title Here Lesson Quiz Find each sum or difference. 1. 8.3 + 2.7 2. 9.7 – 4 3. 22.6 + 8.4 4. Evaluate 12.76 – x for x = 8.41. 5. During an ice-skating competition, Dawn received the following scores: 4.8, 5.2, 5.4. What was Dawn’s total score? 11 5.7 31 4.35 15.4