5.NBT.7. Add, subtract, multiply, and divide decimals to hundredths, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used.
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Ages: 8  14
8632 Views:

When Diffy opens, there are four black numbers placed at the corners of a black square. Your first goal is to fill in the four blanks in the blue circles in the middle of each side of the black square.
Start with any side of the black square and cli...ck in the blank in the blue circle on that side and type in the difference of the black numbers on that side (the larger black number less the smaller one). So if the black numbers on the top side of the black square were 7 and 12, we would type 5 (= 12 – 7) in the blue circle between the 7 and the 12.
Note: There are more directions on the right side.
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May 9, 2010 at 11:11 AM


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Ages: 8  14
8952 Views:

Add and subtract decimal values using base blocks. The problems difficulty is controlled by the user. Set the number of whole number columns up to 100s. Set the decimal places from 0 to 3 places. Other bases are available. Please take a few secon...ds to wait for this virtual manipulate (that uses a Java applet) to fully load. From Utah State University.
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May 9, 2010 at 10:16 AM


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Ages: 8  12
4520 Views:

This is an interactive lesson on place value in slide show / video format. The lesson focuses on place value with whole numbers and decimal numbers, and it provides interactive activities and assessment questions for students.
August 4, 2012 at 01:08 AM


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Ages: 9  18
3576 Views:

Teaches basic steps for multiplying decimals. Solves problem (4.2 X 5.9) by removing the decimal and working as a whole number. Once solved, shows how to determine the decimal place in the answer by counting the digits behind the decimal in the origi...nal problem. Also shows how to round decimal into a whole number to see if answer is correct. Then shows how to solve a problem with no whole number (0.3 X 0.2). Once answered shows how to add zero to whole the whole number place and how to convert to a fraction to check answer.
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November 28, 2010 at 12:41 PM


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Ages: 9  13
3573 Views:

This link is to a slide show containing 36 slides. It reviews division strategies: using multiples of 10, distributive property, equal groups model, and expanded division algorithm. Several word problems are presented in which division is required. I...t also reviews dividing whole numbers and fractions, as well as decimal notation and comparing decimals. The problems relate to many Common Core Standards.
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November 13, 2012 at 12:12 AM


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Ages: 8  13
3257 Views:

In this video you see a whiteboard presentation showing how to solve multiplication problems with decimals. Students could work along with the video or try to race the video when working each problem. Video also has a good review of mathematical te...rms and steps to solving word problems. (6:38)
Download my Math Interactive Whiteboard Lessons and flash games here: http://iwbresources.blogspot.com
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August 28, 2012 at 11:29 AM


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Ages: 10  15
1810 Views:

The instructor provides three problems: (1) .0005 x 10 (2) 2.1005 x 100 (3) 8.9 x 1000. He explains there is only one rule when multiplying decimals by powers of 10: to shift the decimal to the right, and the amount of shift equals the number of zer...os in 10 or power. He uses an interactive white board to work the problems.
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October 14, 2012 at 11:49 PM


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Ages: 10  14
1079 Views:

The instructor uses an interactive white board to show that multiplying a decimal by 10, 100, 1,000, or 10,000 moves the decimal one, two, three, or four places to the right. He displays a calculator to show this as well. He also explains and shows t...hat dividing by a power of 10 moves the decimal place to the left according to the number of zeros in the number you are multiplying by. (6:10)
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October 15, 2012 at 12:15 AM


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Ages: 9  14
574 Views:

The instructor uses a word problem to demonstrate how to multiply a decimal by powers of 10. The word problem provides the cost of a stamp and asks how much a roll of 1000 stamps would cost. He shows how to move the decimal if multiplying by 10, 100,... and finally 1000, arriving at the solution to the word problem.
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October 14, 2012 at 10:46 PM


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Ages: 10  14
474 Views:

The instructor explains how to divide a decimal by power of 10. The problem he works through is: 99.061 / 100. He first shows how to divide the number by 10, and he relates how to move the decimal to the left when dividing. (3:18)
October 15, 2012 at 11:15 PM
