Or, you notice that your wife spends a suspicious amount of time exchanging emails with someone you don’t know.Īt the end of the day – there are plenty of situations in which reading someone’s emails can mean a world of difference. You could have a coworker who you think is plotting your professional demise behind your back. However, there comes a time when you just have to disregard that for a higher cause.įor example – you may want to read someone’s Yahoo mail it could be vitally important to find out what kind of emails they’ve been exchanging with others. Mentally add 10 or 100 to a given number 100–900, and mentally subtract 10 or 100 from a given number 100–900.Įxplain why addition and subtraction strategies work, using place value and the properties of operations.Naturally, all of us tend to respect the privacy of our friends and loved ones. Understand that in adding or subtracting three- digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones and sometimes it is necessary to compose or decompose tens or hundreds. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight, or nine tens (and 0 ones).Ĭompare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and, =, and < symbols to record the results of comparisons.įluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.Īdd up to four two-digit numbers using strategies based on place value and properties of operations.Īdd and subtract within 1000, 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. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight, or nine ones. Understand the following as special cases:ġ0 can be thought of as a bundle of ten ones - called a “ten.” b. Understand that the two digits of a two-digit number represent amounts of tens and ones. In this range, read and write numerals and represent a number of objects with a written numeral. Earn a badge of recognition for teaching digital citizenshipĬompose and decompose numbers from 11 to 19 into ten ones and some further ones, e.g., by using objects or drawings, and record each composition or decomposition by a drawing or equation (e.g., 18 = 10 + 8) understand that these numbers are composed of ten ones and one, two, three, four, five, six, seven, eight, or nine ones.Ĭount to 120, starting at any number less than 120.Join our next professional learning webinar or workshop.
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