Basic facts T3W7

T3W7

Add these numbers using rounding and compensating.

1. 10 + 9=19
2. 7 + 9=16
3. 30 + 79=109
4. 99 + 99=198
5. 17 + 20=37
6. 29 + 33=52
7. 410 + 79=489
8. 1004 + 99=1103
9. 2999 + 708=3707
10. 10,999 + 100=11,000

Reverse these times tables and then answer them e.g. (1 x 2=) 2 x 1= 2

1. 3 x 2=6
2. 4 x 2=8
3. 5 x 10=50
4. 2 x 7=14
5. 3 x 9=27
6. 5 x 17=85
7. 10 x 10=100
8. 10 x 3=30
9. 3 x 9=27
10. 5 x 5=25

How many tens and hundreds are in these numbers? e.g. 793 is 7 hundreds and 9 tens.

1. 70=7
2. 40=4
3. 100=10
4. 90=9
5. 700=70
6. 445=44
7. 49=4
8. 78=7
9. 699=69
10. 1646=164