Mental Maths

You have all gotten so QUICK at adding big and small numbers in your head. Here’s a reminder of the tricks we learnt to get our brains busy!!

 

1. COUNT UP (best for adding on small numbers)
244 + 3 = 247 (, 245, 246, 247)

2. DOUBLES (we should know these off by heart)
8 + 8 = 16


3. NEAR DOUBLES
8 + 7 = 15 (8 + 8 = 16, but I’m adding 8 + 7, so that’s one less which is 15)
12 + 13 = 25 (I know 12+12=24, so 12+13 is 1 one which is 25)
 

4. TEN PARTNERS
1+9=10
2+8=10
3+7=10
4+6=10
5+5=10
24 + 6 = 30 (I know this really quick because 6+4=10 plus 20 =30

5. ADDING 10
22+10=32
48+10=58
123+10=133

6. SEE 9 THINK 10
35 + 9 = 44 (35+10 is easy, 45. But I’m only adding 9 so that’s one less which is 44

7. SEE 11 THINK 10
266 + 11 = 277 ( 266 plus ten is easy, that’s 276. But I’m adding 11 so that’s one more which is 277)

 8. ADDING 100

44+100=144
188+100=288
655+200=855

9. SPLIT IT UP – GREAT FOR BIG NUMBERS
126+45=171 ( 126 plus 40 equals 166 plus 4 equals 170 plus one equals 171)
126 + 40 + 4 +1 = 171



KEEP PRACTICING HERE….. A GREAT GAME