Addition/Subtraction
-8+6
2
-8 x -8
64
Find the HCF of 12 and 18.
6
A number is divisible by 2 if it ends with what digits?
0,2,4,6,8
What is the square root of 49?
7
12−(−7)
19
-60 ÷ 5
Find the LCM of 4 and 10
20
Is 345 divisible by 3?
Yes, because the sum of digits 3+4+5=123 + 4 + 5 = 123+4+5=12, and 12 is divisible by 3.
What is the cube root of 27?
3
The temperature was –3°C in the morning. By afternoon, it rose 8 degrees. What is the new temperature?
5 degrees
−15×6?
-90
Find the HCF of 36 and 48.
12
Which rule do we use to check if a number is divisible by 4?
Look at the last two digits; if they form a number divisible by 4, then the whole number is divisible by 4.
what is the square root of 225
15
−12+6−(−9)
3
−56÷(−7)
8
Find the LCM of 9, 12, and 15
180
Is 8,316 divisible by 6?
Yes, because it’s divisible by 2 (ends in 6) and by 3 (sum of digits 8+3+1+6=188 + 3 + 1 + 6 = 188+3+1+6=18, divisible by 3).
What is the cube root of 1,000?
10
−30+12−(−15)+(−7)
–10
A number is multiplied by –4 to get –48. What is the number?
12
Find the HCF and LCM of 18 and 24
HCF = 6, LCM = 72
Using divisibility rules, check if 10,241 is divisible by 11.
Yes, because (sum of odd place digits 1+2+1=41 + 2 + 1 = 41+2+1=4) and (sum of even place digits 0+4=40 + 4 = 40+4=4); their difference is 4–4=04 – 4 = 04–4=0, which is divisible by 11.
Square root of 81 + cube root of 64
13