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In 1st grade, as students begin learning their basic addition facts, they apply that knowledge in a strategy known as “make a ten” to help make sense of facts that might otherwise be hard to memorize, such as 8 + 4 or 9 + 5. To use the strategy, students decompose one of the addends to make a ten from the other.
: a number to be added to another.
What is number ten? In mathematics, the number 10 represents a quantity or value of 10. The whole number between 9 and 11 is 10. The number name of 10 is ten. Little Sera is showing 10 fingers.
There are nine different facts sums that make 10: 1+9, 2+8, 3+7, 4+6, 5+5, 6+4, 7+3, 8+2, 9+1.
Explain that because the tens digit only changes by 1, we can find 10 more or 10 less by mentally adding or subtracting 1 to the number of tens. I model this by selecting a number and asking students to determine what number is 10 more and what number is 10 less.
Number | Spanish | Pronunciation |
---|---|---|
4 | cuatro | kwah-troh |
5 | cinco | seen-koh |
6 | seis | says |
7 | siete | syay-tay |
Instead of adding two numbers together as they are, encourage students to add them up to 10, and then add the remainder to that 10. For example, the process for 7 + 5 is: 7 + 3 = 10. We still need to add an extra 2, to turn that 3 into 5.
yes there is an answer, it’s -2.
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