Addition within 20
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This document provides an introduction to addition within 20. It includes examples of using number bonds to represent addition problems visually, with parts combining to make a whole. The addition symbol and count-on method for solving problems are demonstrated. Word problems involving addition are presented, such as finding how many sweets Jane has after getting more. The goal is for students to build number sense and skills for solving single-step addition word problems within 20.
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This document provides an overview and guidance for a third grade mathematics unit on number and operations in base ten. It includes key standards, enduring understandings, essential questions, concepts and skills, and example tasks. The unit focuses on place value, rounding, addition, subtraction, and multiplication of whole numbers within 1,000. It also covers creating and interpreting picture graphs, bar graphs, and other data displays. Sample tasks involve word problems, mental math strategies, and using graphs to solve "how many more/less" comparison problems.Vedic math
Vedic mathShahnavazoddin Shaikh
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Vedic math uses mental techniques for calculations based on ancient Indian sutras (aphorisms). One technique is "all from 9 and the last from 10" for subtracting numbers from powers of 10. When subtracting a number from 1000, all digits are subtracted from 9 and the last digit is subtracted from 10. This technique can also be applied to money calculations for determining change amounts mentally.Presentation, Learning Addition (Putting numbers Together) - 1st grade Math.pptx
Presentation, Learning Addition (Putting numbers Together) - 1st grade Math.pptxrochellebrownstein1
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This document introduces numbers to 100, including counting, reading, writing, comparing, ordering, place values, and patterns with numbers. It provides examples of counting items, arranging numbers in ascending and descending order, completing number patterns by adding or subtracting 15 or 20, and encourages trying sample questions to practice these number concepts.Numbers to 40
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The document discusses measurement of time in seconds (s) and the 24-hour clock. It provides examples of adding and subtracting times by following steps of adding or subtracting the hours and minutes separately, and adjusting if the minutes total 60 or more by subtracting 60 from the minutes and adding 1 to the hours. An example word problem is given about a family's travel times to solve for how long they stayed at the zoo, which was 6 hours and 30 minutes.Kungfu math p4 slide9 (subtraction fraction)pdf
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This document discusses subtracting fractions. It provides a 3 step process for subtracting fractions: 1) Make the denominators the same, 2) Subtract the numerators and put the answer over the denominator, and 3) Simplify the fraction if possible. Examples are shown working through subtracting fractions like 29/7 - 2/7 and 1/9 - 2/3. The document emphasizes practicing sample subtraction problems and applying the 3 step process.Ad
Addition within 20
- 1. Whole Numbers Addition Within 20 What will we learn today? Building up number bonds Use the addition symbol (+) to write a mathematical sentence Solving 1-step word problems involving addition
- 2. Number Bonds part whole part part + part = whole We use this symbol to do addition.
- 3. Heres an example. 2 5 3 2 and 3 make 5 2+3=5 There are 5 cars altogether.
- 4. Heres another example. To make 10, we can have a few ? combination of numbers. 1 and 9 make 10 10 2 and 8 make 10 3 and 7 make 10 ? 4 and 6 make 10 5 and 5 make 10
- 5. Heres another example. ? 8 6 whole = 8 1 part = 6 6 and 2 make 8.
- 6. By using the count-on method, you can easily add to find the answer. 5+3 = 8 6 7 8 +1 +1 +1
- 7. Heres another example. 11 + 3 = 14 12 13 14 11
- 8. More than 4 more than 6 is __________. 4 + 6 = 10 5 more than 8 is __________. 5 + 8 = 13
- 9. Word Problem Jane has 9 sweets. Her sister gives her 3 more sweets. How many sweets does Jane have now? 9 + 3 = 12 She has 12 sweets now.
- 10. Heres another example. Tommy bought 10 marbles. Ali bought 6 marbles. How many marbles did they have altogether? 10 + 6 = 16 They had 16 marbles altogether.
- 11. Are you ready to try out the questions?