Vocabulary
Numbers that are easy to add are called _____________.
partial sums, friendly numbers, adjusting, regroup, number line
friendly numbers
14 + 10 =?
24
How can you adjust the numbers to make it easier to solve 37+46?
40+43
33+50
89+11
100
Decompose the second addend by place value and solve.
39+55
39+50+5=94
You can ___________ 10 ones as 1 ten.
partial sums, friendly numbers, adjusting, regroup, number line
regroup
25+31=?
56
How can you adjust the numbers to make it easier to solve 25+39?
24+40
44+68
112
Decompose the second addend by place value and solve.
35+44
35+40+4=79
A ______________ is a line with number labels.
partial sums, friendly numbers, adjusting, regroup, number line
number line
67+22= ?
89
How can you adjust the numbers to make it easier to solve 98+75?
100+73
26+45
71
Decompose the second addend by place value and solve.
56+32
56+30+2=88
When you decompose numbers by place value, and add their parts, you use ___________.
partial sums, friendly numbers, adjusting, regroup, number line
partial sums
99+10=?
109
How can you adjust the numbers to make it easier to solve 38+91?
40+89
65+28
93
Decompose the second addend by place value and solve.
37+79
37+70+9=116
When you make a problem easier to solve by taking some from one addend and giving to another addend, you are _____________.
partial sums, friendly numbers, adjusting, regroup, number line
adjusting
64+51=?
115
How can you adjust the numbers to make it easier to solve 67+43?
70+40
92+86
182
Decompose the second addend by place value and solve.
87+36