By C. Oliver, A. Ledsham, R. Elvin
One among a sequence of 6 books for students within the first years of secondary education. solutions for all 6 books are supplied in a separate solution ebook
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Additional resources for Comprehensive mathematics practice, book 5
11 ϩ 20 ϩ 30 ϭ 61 So, 24 ϩ 37 ϭ 61 32 Sums Let’s try 1,316 ϩ 2,590. thousands hundreds tens 1,316 is broken into 2,590 is broken into Add the ones. Add the partial sum 6 to the tens. 1,000 2,000 300 500 10 90 ones 6 0 6ϩ0ϭ6 6 10 ϩ 90 106 Add the partial 106 sum 106 to the 300 hundreds. ϩ 500 906 Add the partial 906 sum 906 to the 1,000 thousands. ϩ 2,000 3,906 1,316 ϩ 2,590 = 3,906 33 Rounding to Y hundreds tens ones ou can estimate the answer to an addition problem by rounding each number to the greatest (largest) place value.
Add the quarters first. One quarter is 25¢. Now add the 2 dimes. Begin at 25¢ and count up by tens. After 25 is 35, 45. You have 45¢ so far. Now add 3 nickels. Begin at 45 and count by fives. After 45 is 50, 55, 60. You have 60¢ so far. Now add the 6 pennies. Begin at 60 and count by ones. After 60 is 61, 62, 63, 64, 65, 66. You have a total of 66 cents. 39 Adding T o add time values, add minutes to minutes, and hours to hours. 2 hours 22 minutes ϩ 5 hours 10 minutes Write the problem in columns.
Now it is easy to add mentally. 32 ϩ 56 Ϫ2 ϩ2 30 ϩ 58 ϭ 88 Since 32 ϩ 56 ϭ 30 ϩ 58, then 32 ϩ 56 ϭ 88. 37 Adding C oins have values in cents. ” To know the total value of a number of coins, you need to add the value of all the coins. If you have a dime, nickel, and penny, how many cents do you have in all? dime = 10¢ nickel = 5¢ penny = 1¢ 10¢ + 5¢ + 1¢ = 16¢ You have 16 cents in all. Quarters have a value of 25¢. It is easier to add money if you memorize the value of up to four quarters. 25¢ 38 50¢ 75¢ 100¢ Money Coin values can be added quickly by counting.