Show:
Counting Back
Fact Families
Related Facts
Doubles
Subtraction Strategies
100
43 - 2 =
What is 41.
100
11 - 5 =
What is 11-5=6, 11-6=5, 5+6=11, 6+5=11.
100
12 - 4 =
What is 12-4=8, 8+4=12
100
18 - 9 =
What is 18-9=9, 9+9=18
100
8 + 6 =
What is Fact family, Related Fact, Making a Ten (8+6=14).
200
99 - 1 =
What is 98.
200
24 + 6=
What is 24+6=30, 6+24=30, 30-6=24, 30-24=6.
200
55 - 10=
What is 55-10=45, 10+45=55
200
24 - 12 =
What is 24-12=12, 12+12=24
200
9 - 3 =
What is Making a Ten, Counting Back, Fact Family, Related Facts (9-3=6).
300
110 - 2 =
What is 108.
300
88 - 10 =
What is 88-10=78, 88-78=10, 78+10=88, 10+78=88.
300
60 + 40 =
What is 60+40=100, 100-60=40
300
60 - 30 =
What is 60-30=30, 30+30=60.
300
16 - 8 =
What is Doubles (16-8=8, 8+8=16).
400
1,345 - 3 =
What is 1,342.
400
320 - 30 =
What is 320-30=290, 320-290=30, 290+30=320, 30+290=320.
400
1,000 - 500=
What is 1,000 - 500= 500, 500+500=1,000
400
880 - 440 =
What is 880-440=440, 440+440=880.
400
10 - 4 =
What is Related Facts, Fact Families (10-4=6).
500
29, 200 - 1 =
What is 29,199.
500
10,300 + 20,200 =
What is 10,300+20,200=30,500, 20,200+10,300=30,500, 30,500-10,300=20,200, 30,500-20,200=10,300.
500
2,000 - 1,800 =
What is 2,000-1,800=1,200, 1,800+1,200= 2,000.
500
1,560 - 780 =
What is 1,560-780=780, 780+780=1,560
500
90 + 0 = 80 + 1 = 100 + 2 =
What is Counting on (90, 81, 102).