66 Speed Math for Kids
Let’s try 7 as a reference number.
(^7) 6 × 4 = 3
–1
–3
21
- 3
24 Answer
Let’s try 3 as a reference number.
+3
+1
3 6 × 4 = 7
21 - 3
24 Answer
Let’s try 2 as a reference number.
+4
+2
2 6 × 4 = 8
16 - 8
24 Answer
Try using the reference numbers 9 and 11 to multiply 7 by 8.
Let’s try 9 fi rst.
9 7 × 8 =
–2
–1