with regrouping
Add these numbers using any method you want.
27+31+19
77
Which numbers makes a ten?
8+3+2
8 & 2
Which doubles facts equals 2?
1+1
In the equation (8+5+7), which numbers should I start with? WHY?
7 and 5, because they're the smallest numbers.
Add these numbers using any method you want.
44+62+24
130
Which numbers makes a ten?
2+1+9
1 & 9
Which doubles facts equals 8?
4+4
In the equation (1+5+9), which numbers should I start with? WHY?
1 and 9, because they make a ten.
Add these numbers using any method you want.
58+12+14
84
Which numbers makes a ten?
3+4+7
3 & 7
Which doubles facts equals 16?
8+8
What are doubles?
Doubles are two of the same numbers in an equation.
Add these numbers using any method you want.
75+29+39
143
Which numbers makes a ten?
6+5+4
6 & 4
Which doubles facts equals 18?
9+9
What are tens?
Tens are two numbers in an equation that equals 10.
Add these numbers using any method you want.
49+28+47
124
Which numbers makes a ten?
5+4+5
5 & 5
Which doubles facts equals 20?
10+10
Why is it helpful to have tens or doubles when adding?
It's helpful because it makes adding easier and faster.