a) 2 × 9 + 63 = 18 + 63 = 81
b) 24 : 4 + 44 = 6 + 44 = 50
c) 5 × 6 – 12 = 30 – 12 = 18
d) 3 × 7 – 16 = 21 – 16 = 5
a) 2 × 9 + 63 = 18 + 63 = 81
b) 24 : 4 + 44 = 6 + 44 = 50
c) 5 × 6 – 12 = 30 – 12 = 18
d) 3 × 7 – 16 = 21 – 16 = 5
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26+27+28+29+30+31+32+33+34+35+36+37+38+39+40+41+42+43+44+45+46+47+48+49+50+51+52+53+54+56+57+58+59+60+61+62+63+64+65+66+67+68+69+70=?
Tính (theo mẫu) :
Mẫu: 4 × 5 + 10=20 + 10=30 |
---|
a) 4 × 6 + 6 = ....... = .......
b) 4 × 7 + 12 = ...... = ......
c) 4 × 9 + 24 = ..... = ......
d) 4 × 2 + 32 = ..... = .....
1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20+21+22+23+24+25+26
hãy tính nhanh:
A.1+2+3+4+5+6+7+8+9+10+11+12+13-14=?
B.30-29+28-27+26-25+24-23+22-21...+12-11+10-9+8-7+6-5+4-3+2-1=?
giúp mình giải toán lớp 2 : Tính nhanh
a) 12+24+35-2-14-25
b) 1-2+3-4+5-6+7-8+9
c) 25-12-3+24+36
Tính nhẩm:
a)
7 + 5 = ..... 5 + 7 = .....
4 + 9 = ..... 9 + 4 = .....
8 + 7 = ..... 7 + 8 = .....
2 + 9 = ..... 9 + 2 = .....
b)
16 − 8 = ..... 14 − 7 = .....
11 − 9 = ..... 17 − 9 = .....
12 − 5 = ..... 16 − 9 = .....
13 − 6 = ..... 15 − 8 = .....
28+27+26+25+24+23+22+21+20+19+18+17+16+15+14+13+12+11+10+9+8+7+6+5+4+3+2+1+=....................................................?
Tính nhẩm:
14 − 9 = ..... | 16 − 7 = ..... | 12 − 8 = ..... | 6 + 9 = ..... |
8 + 8 = ..... | 11 − 5 = ..... | 13 − 6 = ..... | 18 − 9 = ..... |
14 − 6 = ..... | 17 − 8 = ..... | 12 − 5 = ..... | 3 + 9 = ..... |
9 + 4 = ..... | 11 − 9 = ..... | 3 + 8 = ..... | 16 − 8 = ..... |
Viết các tổng sau thành tích:
a) 5 + 5 + 5 + 5 + 5 + 5 =
b) 4 + 4 + 12 + 8 =
c) 3 + 6 + 9 + 12 =
d) 65 + 93 + 35 + 7 =