Show:
Properties
Mental Math
Addition Patterns
Regrouping
Estimate Sums
100
What property do these equations show? 4+5=9 5+4=0
Commutative
100
5+3=
8
100
Find the missing number: 3+5=8 30+50=80 300+500= ?
800
100
53 +29 ------
82
100
58+21= ? _____+_____=______
60+20=80
200
What property does this equation show? 6+0=6
Identity
200
4+5=
9
200
4+5=9 40+50= 90 400+500= ?
900
200
18 +43 ------
61
200
64+25= ? _____+_____=_____
60+30+90
300
What property does this equation show? 14+0=14
Identity
300
17+2=
19
300
8+5=13 80+50=130 800+500= ?
1,300
300
42 +98 ------
140
300
138+471= ? _____+_____=_____
140+470=610 or 100+500=600
400
What property do these equations show? (2+2)+4=8 2+(2+4)=8
Associative
400
12+3=
15
400
9+8=17 ? + 80=170 900+800=1,700
90
400
475 +525 --------
1,000
400
4,907+1,111= ?
4,910+1,110=6,020 or 4,900+1,100=6,000 or 5,000+1,000=6,000
500
What property do these equations show? 5+(2+3)=10 (5+2)+3=10
Associative
500
9+8=
17
500
7+6=13 70+60=130 7,000+6,000= ?
13,000
500
365 +758 -------
1,123
500
4,305+2,501=?
4,300+2,500=6,800 or 4,000+3,000=7,000