Add using a number line
35+4 tens
What is 75
22+35
What is 57
35+55
90?
55+40
95
20+10
30
3 tens +5 tens
What is 80 or 8 tens
39+44
What is 83?
24+67
71?
33+53
86
30+20
50
22+25
What is 47
66+33.
What is 99?
43+29
72?
22+68
90
50+10
60
30+19
What is 49
45+19.
What is 64.
37+47
84?
18+56
74
70+20
90
54+39
what is 93
28+70.
98?
67+29
96?
39+41
80
40+20
60