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.
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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